Mijia Air Conditioner Pro Eco 3.5 kW FAQ

Parameter Configuration
1. Q: What are the selling points of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The selling points of the Mijia Air Conditioner Pro Eco 3.5 kW are as follows:
1. Outstanding power efficiency;
2. Mijia AI Energy Saving mode for advanced power saving;
3. Smart control via the Xiaomi Home app;
4. 30-second quick cooling, 60-second rapid heating;
5. Gentle airflow with micro-hole air flaps;
6. Operates at a low noise level for optimized nighttime performance.

2. Q: What is included in the standard package of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The standard package of the Mijia Air Conditioner Pro Eco 3.5 kW includes:
1. The indoor unit package contains one indoor unit, one remote control, one user manual, one screw kit, two AAA dry batteries, and one warranty card;
2. The outdoor unit package includes one outdoor unit, four copper pipe nuts, one drain port and one drainage hose.

3. Q: What is the appearance of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The appearance of the Mijia Air Conditioner Pro Eco 3.5 kW is as follows:
1. Geometric form that avoids excessive decorative lines, maintaining a minimalist design language;
2. Smooth and friendly contours that create a strong sense of harmony with home interiors;
3. Equipped with a compact black LED display, preserving the classic Xiaomi design identity for a cohesive and recognizable product style.

4. Q: What color is the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW features a White and Gray color scheme:
1. The versatile color combination complements a wide range of interior decor styles;
2. Neutral tones are chosen to minimize the influence of personal color preferences on purchasing decisions;
3. The white and gray palette aligns with the overall brand identity of Xiaomi products.

5. Q: What are the outer packaging dimensions of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: Inner unit packaging dimensions are 915*292*382 (W*H*D mm) and outer unit packaging dimensions are 925*625*389 (W*H*D mm).

6. Q: What are the dimensions of the indoor and outdoor units of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The net dimensions of the Mijia Air Conditioner Pro Eco 3.5 kW indoor unit are 840*311*200 (W*H*D mm), and the net dimensions of the outdoor unit are 860*551*311 (W*H*D mm).

7. Q: Is the Mijia Air Conditioner Pro Eco 3.5 kW an inverter air conditioner?
A: Yes, the Mijia Air Conditioner Pro Eco 3.5 kW is an inverter air conditioner that intelligently adjusts the compressor’s operating frequency based on the actual environment, set temperature, wind speed, and other factors.

8. Q: What is the net weight of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The net weight of the Mijia Air Conditioner Pro Eco 3.5 kW indoor unit is 9.8 kg, and the net weight of the outdoor unit is 25.5 kg.

9. Q: What is the gross weight of the Mijia Air Conditioner Pro Eco 3.5 kW? (Net weight + outer packaging + accessories)
A: The gross weight of the Mijia Air Conditioner Pro Eco 3.5 kW indoor unit is 11.8 kg, and the gross weight of the outdoor unit is 28.9 kg.

10. Q: What app is the Mijia Air Conditioner Pro Eco 3.5 kW connected to?
A: The Mijia Air Conditioner Pro Eco 3.5 kW supports connection to the Mi Home/Xiaomi Home APP.

11. Q: What is the network access method for the Mijia Air Conditioner Pro Eco 3.5 kW APP?
A: The Mijia Air Conditioner Pro Eco 3.5 kW uses a 2.4GHz Wi-Fi module for network access.

12. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW support firmware upgrades?
A: Yes, the Mijia Air Conditioner Pro Eco 3.5 kW supports remote firmware upgrades. It features full-link OTA (Over-the-Air) technology, allowing continuous product updates to provide you with a fresh and up-to-date experience.
Note:
During an OTA upgrade, the indoor unit display lights up as shown in the figure below. Do not power off or perform any operation, otherwise the upgrade can fail. During the upgrade, the air conditioner restarts, stops, and no indicator is displayed. After the upgrade is complete, the air conditioner returns to normal. The whole upgrade process takes 2-15 minutes, please wait patiently. 


13. Q: What is the rated voltage of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The rated voltage of the Mijia Air Conditioner Pro Eco 3.5 kW is 220-240V~/1 Phase/50Hz.

14. Q: What is the voltage fluctuation range of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW can operate within a standard voltage fluctuation range of 220–240V. In extreme conditions, it can function in a wide voltage range of 130–265V, though this affects the product’s lifespan.

15. Q: What is the rated current of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The rated current of the Mijia Air Conditioner Pro Eco 3.5 kW is not specified and the maximum operating current is 7.1A.

16. Q: What type of power plug does the Mijia Air Conditioner Pro Eco 3.5 kW use?
A: The Mijia Air Conditioner Pro Eco 3.5 kW does not come with a power cord and a power plug for the indoor unit.

17. Q: What is the cooling power of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The rated cooling power of the Mijia Air Conditioner Pro Eco 3.5 kW is 875W.

18. Q: What is the operating temperature range of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The normal operating temperature range of the Mijia Air Conditioner Pro Eco 3.5 kW for cooling is 18℃ to 43℃, and for heating is -20℃ to 24℃.

19. Q: Is the Mijia Air Conditioner Pro Eco 3.5 kW waterproof? What is its waterproof rating?
A: The outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW is waterproof (rainproof) with an IPX4 rating.

20. Q: What certifications does the Mijia Air Conditioner Pro Eco 3.5 kW have?
A: The Mijia Air Conditioner Pro Eco 3.5 kW holds several main certifications, including safety certification (CE), energy efficiency certification (ERP), wireless certification (CE-RED), and environmental certifications (REACH/RoHS).

21. Q: What is the cooling capacity of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The cooling capacity of the Mijia Air Conditioner Pro Eco 3.5 kW is 3500W.

22. Q: What is the cooling area for the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW is recommended for use in areas of 15 to 25 square meters.

23. Q: What is the energy efficiency rating of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The energy efficiency rating of the Mijia Air Conditioner Pro Eco 3.5 kW is A+++ for cooling and A++ (average) /A+++ (warmer) for heating.

24. Q: What type of refrigerant does the Mijia Air Conditioner Pro Eco 3.5 kW use?
A: The Mijia Air Conditioner Pro Eco 3.5 kW uses R32 refrigerant.

25. Q: What is the normal noise level of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The indoor unit noise level is 55 dB(A), and the outdoor unit noise level is 61 dB(A). When combined with ambient noise, the actual measured noise is higher.
Note:
The lowest indoor unit noise is 22 dB, which is the minimum noise level when the indoor unit is operating at air supply mode.

26. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW use DC motors?
A: Yes, both the indoor and outdoor units of the Mijia Air Conditioner Pro Eco 3.5 kW use DC motors. The indoor motor model is RD20HR, and the outdoor motor model is ZKFN-37-10-1.

27. Q: Is the compressor of the Mijia Air Conditioner Pro Eco 3.5 kW an inverter type?
A: Yes, the Mijia Air Conditioner Pro Eco 3.5 kW uses a full DC inverter compressor, model GSX098BKSF6JV9.

28. Q: What brand is the compressor used in the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW uses a compressor manufactured by Highly.

29. Q: How many rows do the condenser and evaporator inside the Mijia Air Conditioner Pro Eco 3.5 kW have?
A: The Mijia Air Conditioner Pro Eco 3.5 kW uses a single-row condenser and a double-row evaporator.

30. Q: How many filters does the Mijia Air Conditioner Pro Eco 3.5 kW have and what types are they?
A: The Mijia Air Conditioner Pro Eco 3.5 kW has only one indoor unit filter located at the top of the indoor unit, which is a PETK antibacterial and anti-mildew filter.

31. Q: Is the filter of the Mijia Air Conditioner Pro Eco 3.5 kW antibacterial and mildew resistant?
A: Yes, the Mijia Air Conditioner Pro Eco 3.5 kW uses an antibacterial and anti-mildew filter.

32. Q: What are the length, diameter, and material of the drainage hose for the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The drainage hose of the Mijia Air Conditioner Pro Eco 3.5 kW is 2 meters long, has a diameter of 18mm, and is made of LDPE + EVA with anti-aging and antioxidant additives.

33. Q: What are the lengths of the high-pressure and low-pressure pipes included in the packaging of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The packaging of the Mijia Air Conditioner Pro Eco 3.5 kW does not include connection pipes.

34. Q: What material are the connection pipes between the indoor and outdoor units of the Mijia Air Conditioner Pro Eco 3.5 kW made of?
A: The packaging of the Mijia Air Conditioner Pro Eco 3.5 kW does not include connection pipes.

35. Q: What type of throttling method does the Mijia Air Conditioner Pro Eco 3.5 kW use?
A: The Mijia Air Conditioner Pro Eco 3.5 kW uses an electronic expansion valve throttling method.

36. Q: What is the airflow circulation volume of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The airflow circulation volume of the Mijia Air Conditioner Pro Eco 3.5 kW is 650 m³/h.

37. Q: What is the maximum current of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The maximum operating current of the Mijia Air Conditioner Pro Eco 3.5 kW is 7.1A.

38. Q: What swing modes does the Mijia Air Conditioner Pro Eco 3.5 kW support?
A: The Mijia Air Conditioner Pro Eco 3.5 kW supports up-and-down swing and left-and-right swing modes.

39. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW support automatic defrosting?
A: The Mijia Air Conditioner Pro Eco 3.5 kW supports automatic defrosting.

40. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW support smart dry mode?
A: Currently, the Mijia Air Conditioner Pro Eco 3.5 kW only supports standard dry mode. Please stay tuned for OTA update notifications, as AI dry mode will be available after a successful upgrade.

41. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW support power consumption statistics?
A: Yes, the Mijia Air Conditioner Pro Eco 3.5 kW supports power consumption statistics. For details, please refer to the Mi Home/Xiaomi Home APP. After selecting the corresponding device, scroll down to view [Battery usage].


42. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW support anti-direct-blow functionality?
A: The Mijia Air Conditioner Pro Eco 3.5 kW is equipped with a gentle airflow air guide blade. By pressing the [Air Flow] button, you can switch between gentle airflow, upward airflow, downward airflow, circulating airflow, and off.

43. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW use an infrared or Bluetooth remote control?
A: The Mijia Air Conditioner Pro Eco 3.5 kW uses an infrared remote control.

44. Q: What material is the screen of the Mijia Air Conditioner Pro Eco 3.5 kW made of?
A: The screen on the indoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW is made of PC material.

45. Q: Does the remote control of the Mijia Air Conditioner Pro Eco 3.5 kW have an LED indicator?
A: The remote control of the Mijia Air Conditioner Pro Eco 3.5 kW does not have an LED indicator.

46. Q: What type of battery does the remote control of the Mijia Air Conditioner Pro Eco 3.5 kW use?
A: The remote control of the Mijia Air Conditioner Pro Eco 3.5 kW uses AAA batteries.

47. Q: How much electricity does the Mijia Air Conditioner Pro Eco 3.5 kW consume daily?
A: The actual electricity consumption of the Mijia Air Conditioner Pro Eco 3.5 kW depends on the operating environment. Factors such as ambient temperature and insulation greatly affect consumption, making it difficult to estimate precisely.To check the electricity usage, you can view it in the Mi Home/Xiaomi Home APP.

48. Q: What smartphone brands and requirements are supported for connecting to the Mijia Air Conditioner Pro Eco 3.5 kW?
A: Both Android and iOS systems can download the Mi Home/Xiaomi Home APP. After downloading the Mi Home/Xiaomi Home APP, you can connect and operate the air conditioner remotely. There are no specific requirements for the smartphone.

49. Q: What mildew does the Mijia Air Conditioner Pro Eco 3.5 kW protect against, and what are the standards?
A: The Mijia Air Conditioner Pro Eco 3.5 kW uses a PETK anti-mildew and antibacterial filter. The tested mildew include Aspergillus niger (CGMCC 3.5487), Chaetomium globosum (CGMCC 3.3601), and Penicillium funiculosum (CGMCC 3.3875). Under standardized test conditions, no significant mildew growth was observed after 28 days of cultivation.

50. Q: Where is the serial number on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The serial number (SN) of the Mijia Air Conditioner Pro Eco 3.5 kW can be found on the labels of the indoor and outdoor unit packaging boxes, the label on the right side panel of the indoor unit, the indoor unit accessory bag (indoor unit SN sticker), the label inside the outdoor unit's large handle.

51. Q: How to distinguish the indoor unit from the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW by the serial number (SN)?
A: 1. The Mijia Air Conditioner Pro Eco 3.5 kW cannot be distinguished as indoor or outdoor unit by the serial number alone. However, you can check the model number on the SN label to differentiate. The indoor unit model is ASH-12W/N1C3-EU, where “W” stands for indoor unit. The outdoor unit model is ASH-12O/N1C3-EU, where “O” stands for outdoor unit.

52. Q: What are the key features of a split-type air conditioner like the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW, as a split-type air conditioner, has the following key features:
1. The structure of the conditioner consists of an indoor unit and an outdoor unit, which are installed separately indoors and outdoors and connected by refrigerant piping and communication cables;
2. The types of split air conditioners include wall-mounted, floor-standing, ceiling-suspended, embedded, and floor-type models.
Here are the advantages of the split-type air conditioner:
1. The air conditioner features an attractive appearance, a wide range of styles, a compact design, low noise levels, and flexible usage;
2. The indoor unit can be installed flexibly, and the size of the outdoor unit is less restricted;
3. The noise level is very low and can be as low as 40–50 dB, which is quieter than the approximately 60 dB of window-type air conditioners;
4. The split-type air conditioner does not affect indoor lighting and helps avoid issues such as window vibration caused by the operation of the air conditioner;
5. It is easy to install and maintain;
6. It is economical, practical, and durable.

53. Q: What are the household safety instructions for the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW comes with the following safety instructions for household use:
1. This product can only use the power supply indicated on the nameplate. Please use the specified power cord and do not change it by yourself;
2. Do not connect the grounding wire of the power supply to a gas tank or water pipe. Insufficient grounding results in electric shock;
3. Make sure that the wiring harness, drainage pipe, and compressor pipe are connected correctly. Improper connection causes the air conditioner not to function normally or reduce performance after some time or even have problems of water leakage, electrical leakage, fluorine leakage, electric shock, or fire accidents;
4. Use the button to turn the product on or off. Please turn off the product and cut off the power when not in use for a long time;
5. When the ambient humidity is high, please increase the fan speed or adjust the air guide blade angle to the maximum using the wind direction button to prevent water droplets from falling;
6. Do not install the air conditioner in places where flammable or explosive gases leak, where the environment is humid, or where electromagnetic interference is significant. The indoor unit of this air conditioner is not waterproof, so do not use it in humid environments such as laundry rooms or bathrooms;
7. When indoor ventilation equipment is used together with indoor heating equipment or gas stoves, it should be ensured to avoid hypoxic accidents caused by insufficient ventilation;
8. Do not blow the air from the air conditioner directly to animals or plants, otherwise it can cause adverse effects;
9. When cleaning the air conditioner, be sure to turn it off and cut off the power supply, and make sure that the air conditioner has completely stopped before operating;
10. Do not poke your fingers or sticks into the exhaust inlet or exhaust outlet of the air conditioner. Otherwise, it causes damage to the air conditioner or even personal injury;
11. Do not place any objects on the outdoor unit and check its mounting bracket frequently. If there is any damage, repair it in time. Otherwise, the outdoor unit will fall and cause injury;
12. If any abnormality in the air conditioner (such as a burnt smell) is found, turn the air conditioner off, cut off the power supply immediately, and contact the after-sales service team;
13. For safety's sake, cut off the power supply before touching the air conditioner;
14. Do not install the air conditioner in special places such as ships or vehicles.
For the rest, please refer to the instruction manual.

54. Q: What to do if there’s a tingling sensation (electric shock) when accidentally touching the Mijia Air Conditioner Pro Eco 3.5 kW during use?
A: To ensure your safety, do not touch the indoor or outdoor units of the Mijia Air Conditioner Pro Eco 3.5 kW while it is operating. If you experience a tingling sensation when touching the outdoor unit, please contact a qualified technician to check and properly connect the ground wire. This helps prevent potential electric shocks or other safety hazards. If the ground connection is confirmed to be normal, please contact after-sales service for further inspection.

55. Q: What is the dehumidification capacity of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW has a dehumidification capacity of 1.4 liters per hour (1.4 L/h).

56. Q: Where is the production date of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The production year and month of the Mijia Air Conditioner Pro Eco 3.5 kW can be found on the product labels located on both the indoor and outdoor units. 
Here is an example:


57. Q: What do the letters and numbers in the model number of the Mijia Air Conditioner Pro Eco 3.5 kW mean?
A: The model number of the Mijia Air Conditioner Pro Eco 3.5 kW is ASH-12WO/N1C3-EU, and each part represents the following:
Product Category Code: A – Air Conditioner
Type Code: S – Split
Heating and Cooling Code: H – Heating and cooling
Capacity Code: 12 – 12000 BTU/h
Indoor Unit Code: W – Wall-mounted
Outdoor Unit Code: O – Outdoor unit
Series/Product Iteration Code: N1 – Energy-saving series
Refrigerant Code: C – R32 refrigerant
Energy Efficiency Level: 3 – Cooling A+++
Energy Efficiency Standard Code: EU – European Union

58. Q: How often does the Mijia Air Conditioner Pro Eco 3.5 kW need refrigerant refilling?
A: The Mijia Air Conditioner Pro Eco 3.5 kW generally does not require regular refrigerant refilling because the refrigerant circulates within a sealed system and does not get consumed under normal conditions. Refrigerant only needs to be replenished if there is a system leak.

59. Q: How is the refrigerant distributed in the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The refrigerant in the outdoor unit’s condenser of the Mijia Air Conditioner Pro Eco 3.5 kW is distributed through a four-in, four-out manifold system.

60. Q: How is the refrigerant distributed in the indoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The refrigerant in the indoor unit’s evaporator of the Mijia Air Conditioner Pro Eco 3.5 kW is distributed through a two-in, one-out manifold system.

61. Q: What is the GWP value of the refrigerant used in the Mijia Air Conditioner Pro Eco 3.5 kW, and is there a difference between GWP 1.0 and 1.5?
A: The Mijia Air Conditioner Pro Eco 3.5 kW uses the environmentally friendly refrigerant R32 (difluoromethane), which has a Global Warming Potential (GWP) of 675 according to the IPCC AR5 standard. This represents a 68% reduction in greenhouse effect compared to the traditional refrigerant R410A (GWP 2088), and its ozone depletion potential (ODP) is zero. This value is a fixed parameter certified by international authoritative organizations and does not require separate testing. It complies with the Kigali Amendment as well as environmental certification requirements in the EU and the United States.

62. Q: What is the SEER value of the 12,000 BTU Mijia Air Conditioner Pro Eco 3.5 kW for the EU?
A: The SEER (Seasonal Energy Efficiency Ratio) measures the energy efficiency of an air conditioner over the cooling season at varying outdoor temperatures and is especially used to evaluate the real energy consumption of inverter air conditioners. The Mijia Air Conditioner Pro Eco 3.5 kW released by Xiaomi in the EU has a SEER value of 8.5.

Feature Usage
1. Q: How to connect the Mijia Air Conditioner Pro Eco 3.5 kW to the Mi Home/Xiaomi Home APP?
A: To connect your Mijia Air Conditioner Pro Eco 3.5 kW to the Mi Home/Xiaomi Home APP, install the APP and log into your account. Then follow the steps below for configuration:
1. First, connect your phone to your home Wi-Fi network. Then, open the Mi Home/Xiaomi Home APP and tap the [+] icon in the upper right corner to enter the [Add device] page. Tap the detected device name to enter the Wi-Fi configuration screen. Please refer to the illustrated instructions for guidance;
2. Follow the on-screen prompts step by step until the message [Device added successfully] appears.
Note:
1. On Android devices, the Mi Home/Xiaomi Home APP allows you to add the air conditioner via either nearby devices or manual add. On iOS devices, after tapping the [+] icon on the home interface, you can either manually select the air conditioner or tap on the nearby devices detected automatically via Bluetooth;
2. Firmware update is supported for both the indoor and outdoor units.

2. Q: How to reset the Wi-Fi on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: To reset the Wi-Fi module of the Mijia Air Conditioner Pro Eco 3.5 kW, press and hold the [Sleep] and [Light] buttons simultaneously for 3 seconds. This will restore the Wi-Fi settings to default.

3. Q: How to adjust the temperature on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: In Cooling Mode, the temperature range of the Mijia Air Conditioner Pro Eco 3.5 kW can be adjusted between 16℃ and 31℃. Use the [+] and [−] buttons on the remote control to change the temperature. Each press adjusts the temperature by 0.5℃.

4. Q: How to control the Mijia Air Conditioner Pro Eco 3.5 kW using the remote control?
A: The remote control for the Mijia Air Conditioner Pro Eco 3.5 kW uses infrared (IR) signals. To operate, point the remote control towards the front of the air conditioner (the display panel) to control it.
Note:
1. The infrared receiver is located behind the display panel, which is slightly translucent;
2. The effective remote control distance is less than 8 meters, within approximately a 45° angle to the left or right.

5. Q: How to install batteries in the remote control of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: To install batteries in the remote control of the Mijia Air Conditioner Pro Eco 3.5 kW, please follow these steps:
1. Press the groove at the top of the battery cover with your finger, then slide the cover downward (see left image);
2. Open the battery compartment and insert two AAA batteries according to the polarity shown in the right image. Then close the battery cover securely.

Note:
Please pay attention to the battery polarity when installing batteries in the remote control of the air conditioner. Incorrect installation causes the remote control to malfunction. Do not pull or forcefully pry open the battery cover.

6. Q: How to update the firmware of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: When a new version is available, a firmware update prompt will appear in the [...] menu in the top right corner of the device interface in the Mi Home/Xiaomi Home APP. The firmware of the Mijia Air Conditioner Pro Eco 3.5 kW is continuously updated and optimized. To ensure the best experience, it is recommended to keep the firmware up to date.
Note:
Do not cut off the air conditioner's power during the upgrade process.

7. Q: How to set the turn-on/off timer for the Mijia Air Conditioner Pro Eco 3.5 kW?
A: You can use the remote control to set the timer on the Mijia Air Conditioner Pro Eco 3.5 kW. When the air conditioner is on, you can set an auto turn-off timer, and when it is off, you can set an auto turn-on timer. Press the [Timer] button to enter timer mode, and press [+] or [−] to adjust the time. The setting will be automatically confirmed after 2 seconds of inactivity.
Note:
The turn-on timer defaults to the mode, temperature, fan speed, and swing modes used before the last shutdown. If you would like to use the functions during the next turn-on, you can set the mode, temperature, fan speed, and swing modes as needed when the air conditioner is running, and then turn off the air conditioner and set the turn-on timer.
In addition, the Mi Home/Xiaomi Home APP offers three ways to schedule turn-on/off timer functions for the air conditioner, as described below:
1. You can set a turn-on time for the air conditioner by using the [Timer] function on the device interface and selecting [Power on timer];
2. You can also use the [Schedule] option under the same [Timer] function to set both a start time and an end time. The air conditioner will automatically turn on at the beginning of the specified period and turn off at the end;
Note:
This method allows you to schedule both turn-on and turn-off times within a specific time range.
3. Another method is to create a custom smart scene in the [Smart] section of the Mi Home/Xiaomi Home APP. This allows you to schedule the air conditioner to turn on or off at specific times based on preset conditions.

8. Q: How to enable multi-person control of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: After connecting and binding the Mijia Air Conditioner Pro Eco 3.5 kW in the Mi Home/Xiaomi Home APP, you can tap the [Settings] >> [Share device] to share it with family members. Once shared, multiple people can control the same air conditioner from their own devices.


9. Q: How to create smart scenes between the Mijia Air Conditioner Pro Eco 3.5 kW and other devices?
A: The Mijia Air Conditioner Pro Eco 3.5 kW supports setting up smart scenes to link and interact with other devices. You can open the Mi Home/Xiaomi Home APP, tap the three-dot icon at the upper right corner >> [Automation] >> tap the [+] icon at the top right to set it up.


10. Q: How to adjust the operating mode of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: Press the [Mode] button on the remote control to switch the operating modes of the Mijia Air Conditioner Pro Eco 3.5 kW in sequence: Cooling Mode, Dry Mode, Fan Mode and Heating Mode.

11. Q: How to adjust the fan speed of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: Press the [Fan Speed] button on the remote control to adjust the fan speed of the Mijia Air Conditioner Pro Eco 3.5 kW. The fan speed options include automatic, quiet (level 1), low (level 2), low-medium (level 3), medium (level 4), medium-high (level 5), high (level 6), and super-high (level 7).
Note:
The fan speed is not adjustable in Dry Mode.

12. Q: How to enable the child lock function on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: Simultaneously press and hold [+] and [-] for more than 3 seconds to enable or disable the child lock function of the remote control.

13. Q: How to adjust the airflow direction of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: To adjust the airflow direction of the Mijia Air Conditioner Pro Eco 3.5 kW, please refer to the following steps:
1. Press the [Left/Right Swing] button on the remote control to turn the horizontal swing function on or off;
2. Press the [Up/Down Swing] button on the remote control to turn the vertical swing function on or off.

14. Q: How to adjust the display brightness of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW supports turning the display light on or off. Press the [Light] button on the remote control to turn the display of the indoor unit on or off.

15. Q: How to turn the Mijia Air Conditioner Pro Eco 3.5 kW on or off?
A: Press the [On/Off] button on the remote control to turn the Mijia Air Conditioner Pro Eco 3.5 kW on or off.

16. Q: How to enable the sleep mode on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: Follow the steps below to enable the sleep mode on the Mijia Air Conditioner Pro Eco 3.5 kW:
1. In cooling or heating mode, press the [Sleep] button to turn on or off sleep mode. When sleep mode is on, the sleep icon will appear on the remote control display;
2. In sleep mode, the device will automatically adjust the temperature according to the sleep curve.

17. Q: How to use the dry mode on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: Press the [Mode] button on the remote control to cycle through the operating modes until [Dry Mode] is selected and the dehumidification icon appears on the display of the Mijia Air Conditioner Pro Eco 3.5 kW.

18. Q: How to restore the Mijia Air Conditioner Pro Eco 3.5 kW to factory settings?
A: To restore factory settings of the Mijia Air Conditioner Pro Eco 3.5 kW, please refer to the following steps:
Within five minutes after the air conditioner connecting to power (make sure it is turned off), quickly press the [Light] button on the remote control six times in five seconds and then the air conditioner makes a buzzer sound for two seconds. Disconnect the power and reconnect the power, and the factory settings will be restored.
Note:
1. When restored to the factory settings, the air conditioner will delete all data including but not limited to the set temperature, fan speed, timing information, function switches, and accumulated electricity consumption;
2. It is not recommended to restore the factory settings unless necessary, so as not to affect the experience of some functions. For example, the accumulated electricity consumption value will be significantly different from the actual electricity consumption value.

19. Q: What precautions should be taken when using the Mijia Air Conditioner Pro Eco 3.5 kW?
A: Please pay attention to the following precautions when using the Mijia Air Conditioner Pro Eco 3.5 kW:
1. First, confirm the operating conditions;
(1). For Cooling Mode, the suitable temperature range is from 18℃ to 43℃. If the ambient temperature is too high or too low, the device will automatically shut down to protect itself;
(2). For Heating Mode, the suitable temperature range is from -20℃ to 24℃. Similarly, the device will shut down automatically if the ambient temperature exceeds this range.
2. Second, for safety-related precautions, please refer to the user manual.

20. Q: How to use the drying function of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW supports the drying function. You can activate Dry Mode using the remote control or set it up through the Mi Home/Xiaomi Home APP by tapping the three-dot icon at the upper right corner >> [Drying function].


21. Q: How to use the AI features of the Mijia Air Conditioner Pro Eco 3.5 kW?    
A: Please follow the steps below to use the AI features of the Mijia Air Conditioner Pro Eco 3.5 kW:
1. It supports voice intelligent control via Google Home and Amazon Alexa;
(1). Download and log in to the Google Home and Amazon Alexa apps;
(2). Connect (bind) the air conditioner device you want to control within the voice assistant app. If you have a Google or Alexa smart speaker at home, you can also bind the air conditioner to the speaker;
(3). Once connected to the network, you can use voice control functions.
2. The AI energy saver feature uses a fully self-developed deep learning algorithm in the cloud to achieve long-term energy saving and improve environmental adaptability.
(1). After the air conditioner is connected to the internet, it automatically detects its environment and location, intelligently selecting modes based on scenarios;
(2). For example, when the ambient temperature is 40℃ and the room size is 16m², the air conditioner will quickly cool the room. When in Cooling Mode, enabling AI energy saver mode (button name will be adjusted) in the Mi Home/Xiaomi Home APP helps maintain precise and stable temperature control, achieving long-term energy savings.

22. Q: How to check the filter lifespan of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW does not use a replaceable filter. The built-in filter screen is generally durable and not easily damaged. Just make sure to clean it as prompted by the system.

23. Q: How to view the sleep operation curve of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: Please follow the steps below to view the sleep curve of the Mijia Air Conditioner Pro Eco 3.5 kW:
1. Open the Mi Home/Xiaomi Home APP and locate the air conditioner you want to check;
2. Tap the top right corner to enter [Settings] >> [Additional features] >> [Customize sleep curve] to view the sleep operation curve.


24. Q: How to change the device name of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: To change the name of the Mijia Air Conditioner Pro Eco 3.5 kW, please follow these steps:
1. Open the Mi Home/Xiaomi Home APP and locate the device;
2. Enter the [Settings] >> [Device name] to change the device name;
3. Modify the name as desired and confirm to ensure the changes are saved successfully.


25. Q: How to manage the location of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: To manage the location of the Mijia Air Conditioner Pro Eco 3.5 kW, please follow these steps:
1. Open the Mi Home/Xiaomi Home APP and locate the device;
2. Enter the [Settings] >> [Manage locations] to manage device location.


26. Q: How to add a desktop shortcut for the Mijia Air Conditioner Pro Eco 3.5 kW?
A: To add a desktop shortcut for the Mijia Air Conditioner Pro Eco 3.5 kW, please follow these steps:
1. Open the Mi Home/Xiaomi Home APP and locate the device;
2. Tap the [┇] or [...] icon at the top right of the device interface, navigate to [Settings] >> [Additional settings] >> [Add to Home screen] to create the desktop shortcut.


27. Q: What temperature setting is the most energy-efficient for the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The energy efficiency of the Mijia Air Conditioner Pro Eco 3.5 kW depends largely on factors such as room size and insulation. Generally, considering both comfort and energy savings, the optimal temperature settings for the air conditioner are 24–28℃ in Cooling Mode and 18–22℃ in Heating Mode.

28. Q: How to bind the Mijia Air Conditioner Pro Eco 3.5 kW to a smart band and control it via the smart band?
A: The Mijia Air Conditioner Pro Eco 3.5 kW currently does not support binding to smart bands.

29. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW have a memory function? (Will it restore previous settings after a power outage?)
A: The Mijia Air Conditioner Pro Eco 3.5 kW has a power-off memory function that saves the operating status before the power outage. However, after power is restored, the air conditioner will not turn on automatically and requires you to manually power it on.

30. Q: How to use the Auto Clean function of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: When the Mijia Air Conditioner Pro Eco 3.5 kW is off, press and hold the [ECO] and [Timer] buttons on the remote control simultaneously for 3 seconds to activate the Auto Clean mode. The Auto Clean process takes approximately 40 minutes.

31. Q: How to use the ECO function of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: To use the ECO function of the Mijia Air Conditioner Pro Eco 3.5 kW, please refer to the following methods:
1. In Cooling/Heating Mode, press and hold the [ECO] button for less than 3 seconds to turn on or off the ECO mode, and the remote control display shows [ECO] when the ECO mode is on;
2. In Heating Mode, press and hold the [ECO] button for 3 seconds to activate/deactivate 8℃ heating, and the set temperature display area on the remote control displays [8℃] when the 8℃ heating is activated.
Note:
After enabling the ECO mode, temperature adjustment is disabled. To adjust the temperature, please turn off the ECO mode.

32. Q: How to turn the Mijia Air Conditioner Pro Eco 3.5 kW on and off?
A: To turn the Mijia Air Conditioner Pro Eco 3.5 kW on or off, please follow these methods:
1. Point the remote control at the air conditioner display and press the power button to turn it on or off;
2. When the air conditioner is connected to the internet, you can also use the Mi Home/Xiaomi Home APP to turn it on or off by pressing the power button;
3. For scheduled power on/off, use the timer button on either the remote control or the Mi Home/Xiaomi Home APP to set the desired times.

33. Q: What modes does the Mijia Air Conditioner Pro Eco 3.5 kW have?
A: The Mijia Air Conditioner Pro Eco 3.5 kW supports four modes, which are Cooling Mode, dry mode, Fan Mode, and Heating Mode.

34. Q: Can the piping direction of the indoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW be changed?
A: Yes, the piping direction of the indoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW can be adjusted. It supports left outlet, rear outlet, and right outlet configurations.

35. Q: Why is the filter of the Mijia Air Conditioner Pro Eco 3.5 kW located at the top? What are the advantages?
A: The Mijia Air Conditioner Pro Eco 3.5 kW adopts an integrated top-mounted filter design to simplify product development and meet the need for top air intake and dust blocking.
The advantages are as follows:
1. The filter is easy to remove, only one step is needed without disassembling other parts;
2. The integrated filter does not need to be separated for cleaning, making maintenance more convenient.

36. Q: How to use the Turbo mode on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: After the Mijia Air Conditioner Pro Eco 3.5 kW is powered on and running normally, you can press the [Turbo] button on the remote control to enable or disable Turbo mode. If the air conditioner is connected to the internet, you can also enable or disable Turbo mode via the [Turbo] icon in the Mi Home/Xiaomi Home APP.

37. Q: How does Turbo mode work on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: Turbo mode instantly boosts the Mijia Air Conditioner Pro Eco 3.5 kW’s cooling capacity to its maximum to achieve rapid cooling. Once Turbo mode is activated, the system increases the operating frequency and speed of components such as the compressor and fan to their highest levels, allowing the air conditioner to cool the room as quickly as possible.

38. Q: How to use the gentle airflow function on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: In Cooling Mode, press the [Air Flow] button on the remote control to cycle through gentle airflow, upward airflow, downward airflow, circulating airflow, and off. When the setting remains on [gentle airflow], the gentle airflow function is activated. In Heating Mode, pressing the [Air Flow] button cycles through upward airflow, downward airflow, and turning off the wind feeling.

39. Q: How does the gentle airflow function work on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW is equipped with gentle airflow air guide blade. When the gentle airflow function is activated, the left-right swing stepper motor adjusts the angle of the air guide blade to be perpendicular to the airflow direction. Air passes through the holes reserved on the left and right air guide blade, dispersing the airflow to create a soft wind effect. Additionally, adjusting the angle of the air guide blade allows control of the airflow direction.

40. Q: After the Mijia Air Conditioner Pro Eco 3.5 kW is connected to Wi-Fi, will it automatically reconnect after a power outage and restoration?
A: Once the Mijia Air Conditioner Pro Eco 3.5 kW is connected to Wi-Fi, it will automatically reconnect after a power outage and when power is restored. However, if the power outage lasts for a long time and it cannot reconnect, please reset the Wi-Fi settings and reconnect the device.

41. Q: How does the Auto Clean mode work on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: During the evaporator Auto Clean process of the Mijia Air Conditioner Pro Eco 3.5 kW, the system goes through a series of steps including evaporator cooling and condensation, frosting, defrosting, and heated drying.

42. Q: Is it necessary to connect the Mijia Air Conditioner Pro Eco 3.5 kW to the Mi Home/Xiaomi Home APP to use it?
A: It is not necessary to connect the Mijia Air Conditioner Pro Eco 3.5 kW to the Mi Home/Xiaomi Home APP to operate it. All functions on the remote control can be used normally without the app. However, connecting to the Mi Home/Xiaomi Home APP enables features such as remote control, smart adjustments, scheduled on/off, device interconnectivity, and filter clogging alerts. Therefore, it is recommended to connect the air conditioner to the APP for a more convenient and intelligent experience.

43. Q: What voice commands are supported by the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW supports voice commands via Google Assistant. Currently, you can control the air conditioner using the following voice commands:
1. Power on/off: “Hey Google, turn on/off [device name]”;
2. Adjust fan speed: “Hey Google, set [device name] speed to [speed name]”;
3. Adjust temperature: “Hey Google, set [device name] to xx degrees”;
4. Change mode: “Hey Google, set [device name] to [mode name]”.

44. Q: Which languages does the Google Assistant voice command function of the Mijia Air Conditioner Pro Eco 3.5 kW support?
A: The Mijia Air Conditioner Pro Eco 3.5 kW supports voice control via Google Assistant in up to 16 languages:
Danish, Dutch, English, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Norwegian, Portuguese, Spanish, Swedish, Thai, and Chinese.
For other languages, please wait for future updates from Google Assistant.

Troubleshooting
1. Q: What to do if the air conditioner cannot connect to the Mi Home/Xiaomi Home APP?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW cannot connect to the Mi Home/Xiaomi Home APP, please follow these steps:
1. Make sure the air conditioner is turned on and in the waiting-to-connect state. Cut off the power for 10 seconds, then turn it back on, or reset the air conditioner’s Wi-Fi and try connecting again;
2. Confirm that the Wi-Fi network you are connecting to is 2.4GHz, as the air conditioner does not support 5GHz Wi-Fi;
3. Ensure the router is not too far from the air conditioner and that it has a stable internet connection;
4. Check that the router’s SSID and password do not contain Chinese characters or special symbols, and make sure the SSID and password are entered correctly;
5. Try connecting using a mobile hotspot to check if the issue is related to the router’s network;
6. Update the Mi Home/Xiaomi Home APP to the latest version, or uninstall and reinstall it, and carefully follow the connection instructions within the APP;
7. If the problem persists after trying the above steps, please contact after-sales support for further assistance.

2. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW firmware update fails in the Mi Home/Xiaomi Home APP?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW firmware update fails, please follow these steps:
1. Ensure the Mi Home/Xiaomi Home APP is updated to the latest version and try again;
2. Check if the Wi-Fi network is working properly and has internet access;
3. Try connecting to a different network environment to see if the update can proceed;
4. During the firmware update process, do not exit the update interface or close the Mi Home/Xiaomi Home APP to ensure the update completes successfully;
5. If these steps do not resolve the issue, please contact after-sales support for assistance.

3. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW automatically stops working during the cooling process?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW stops working, please follow these steps:
1. Confirm whether the ambient temperature has reached the set temperature. When the set temperature is reached, the air conditioner will reduce frequency and fan speed;
2. Turn on the ECO mode to check if the air conditioner can operate normally;
3. Check if the air conditioner displays any error codes. Some codes indicate protection mode. If so, turn off the power, wait for a while, then turn it back on to resume normal operation;
4. If these steps do not resolve the issue, please contact after-sales service for inspection.

4. Q: What are the different statuses of the Wi-Fi indicator on the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The statuses of the Wi-Fi indicator on the indoor unit display of the Mijia Air Conditioner Pro Eco 3.5 kW are as follows:
1. When the Wi-Fi is not connected within 30 minutes, the Wi-Fi indicator blinks;
2. When the Wi-Fi is not connected for more than 30 minutes, the Wi-Fi indicator turns off while the air conditioner is powered on;
3. When the Wi-Fi is connected, the Wi-Fi indicator remains solid while the air conditioner is powered on;
4. In standby mode (power-off state), the Wi-Fi indicator remains solid.

5. Q: What to do if the Wi-Fi indicator on the Mijia Air Conditioner Pro Eco 3.5 kW is showing abnormally?
A: Please check whether the Mijia Air Conditioner Pro Eco 3.5 kW is connected to the network properly. If it fails to connect, please contact after-sales service for inspection.

6. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW cannot adjust the temperature?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW cannot adjust the temperature, please follow the troubleshooting steps below:
When the remote control doesn't work:
1. First, check whether the remote control batteries have power. If they are dead, replace them with new ones;
2. If the batteries are working, check whether the display is normal and if other buttons on the remote work properly;
3. Check whether the air conditioner is in ECO mode or Sleep mode, as these modes limit temperature adjustment;
4. After confirming that the remote is functional, check whether the air conditioner is receiving the signal (e.g., listen for a beep sound);
5. Turn off the power to the air conditioner for 3–5 minutes, then restart it and see if the issue is resolved;
6. If the issue persists, please contact after-sales service.
When the Mi Home/Xiaomi Home APP doesn't work:
1. Disconnect the app completely (remove the device from Mi Home/Xiaomi Home APP and reset the air conditioner's Wi-Fi), and try using only the remote;
2. Check whether other household devices are interfering with the signal. Observe if the issue occurs after operating another remote control;
3. If the above steps do not resolve the problem, please contact after-sales service;
4. If the issue is resolved, it is due to smart settings in the Mi Home/Xiaomi Home APP (such as an automation like Sleep curve or ECO mode). In that case, reset the air conditioner's Wi-Fi, reconnect it in Mi Home/Xiaomi Home APP, and clear the device’s historical data.
If both the remote control and the Mi Home/Xiaomi Home APP cannot control the device, please contact after-sales service for inspection.

7. Q: What to do if the temperature of the Mijia Air Conditioner Pro Eco 3.5 kW is not suitable?
A: If the temperature of the Mijia Air Conditioner Pro Eco 3.5 kW is not suitable, please follow these steps:
1. Check the mode settings. Make sure the correct mode is selected according to the current season, such as cooling or ventilation;
2. Adjust the temperature setting. You can raise or lower the set temperature based on your comfort needs;
3. Adjust the fan speed. Changing the fan speed can help improve the temperature and enhance comfort;
4. Inspect the indoor unit filter. If the filter is dirty or clogged, clean it to restore proper airflow and cooling performance.

8. Q: What to do if the air direction of the Mijia Air Conditioner Pro Eco 3.5 kW cannot be adjusted?
A: If the air direction of the Mijia Air Conditioner Pro Eco 3.5 kW cannot be adjusted, please follow these steps:
1. Check the settings to make sure the swing function is enabled;
2. Gently move the air deflector to see if it is stuck. If it is, check whether any objects are blocking the deflector;
3. If the issue persists after these checks, please request after-sales service for further inspection.

9. Q: What to do if the fan speed of the Mijia Air Conditioner Pro Eco 3.5 kW cannot be adjusted?
A: If the fan speed of the Mijia Air Conditioner Pro Eco 3.5 kW cannot be adjusted, please follow these steps:
When the remote control cannot adjust the fan speed:
1. Check whether the remote control batteries have power. If they are depleted and the remote is unresponsive, replace them with new ones;
2. After confirming the batteries are functional, check whether the remote control display is working and if other buttons respond correctly;
3. Make sure you are checking the fan speed level in the upper LCD area of the remote control and using the fan speed button to make adjustments;
4. If the remote appears normal, confirm whether the air conditioner is receiving the remote signal, such as by listening for a beep sound;
5. Turn off the air conditioner power for 3 to 5 minutes, then restart it and check if the fan speed adjustment works again;
6. If the issue still cannot be resolved after following the above steps, please request after-sales service for further inspection.
When the Mi Home/Xiaomi Home APP cannot adjust the fan speed:
1. Disconnect the air conditioner from the Mi Home/Xiaomi Home APP completely. Delete the device in the app and reset the air conditioner's Wi-Fi settings. Then control it only using the remote control;
2. Check if there is interference from other remote-controlled devices in your home. Confirm whether the problem occurs when using another device’s remote;
3. If the issue persists after these checks, please request after-sales service for further inspection;
4. If the problem is resolved after disconnection, it is due to smart settings in the Mi Home/Xiaomi Home APP. You can reset the air conditioner's Wi-Fi and reconnect it to the app to clear the previous data.
If both the remote control and the Mi Home/Xiaomi Home APP are unable to adjust the fan speed, please contact after-sales service for inspection.

10. Q: What to do if the turn-on/off timer function of the Mijia Air Conditioner Pro Eco 3.5 kW does not work?
A: If the turn-on/off timer function of the Mijia Air Conditioner Pro Eco 3.5 kW does not work, please follow these steps:
1. First, check whether the device is properly connected to the internet. The turn-on/off timer function requires a stable network connection to operate;
2. If the device is online but the function still cannot be used, try restarting the air conditioner to see if the issue is resolved;
3. If restarting does not help, check whether the scheduled task was set through the Mi Home/Xiaomi Home APP. If so, make sure the device’s memory chip has not been reset due to a power outage. If the timer was set using an automation scene in the Mi Home/Xiaomi Home APP, please note that it will not work if the device is offline, as the command must be sent from the server via the network.

11. Q: What to do if the cooling performance of the Mijia Air Conditioner Pro Eco 3.5 kW is poor?
A: If the cooling performance of the Mijia Air Conditioner Pro Eco 3.5 kW is poor, please follow these steps:
1. Check the air conditioner settings. Turn off the sleep mode and increase the indoor unit’s fan speed to improve cooling performance;
2. Inspect the usage environment. Make sure there are no heat sources indoors and that doors and windows are properly closed;
3. Check whether the air conditioner’s air intake and outlet vents are blocked. Ensure proper airflow;
4. Check if the indoor unit filter is dirty or clogged. Clean the filter if necessary;
5. If the outdoor temperature exceeds 43℃, the cooling performance will naturally decline. This is normal;
6. If the issue persists after these checks, please request after-sales service for inspection.

12. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW is not cooling?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW is not cooling, please follow these steps:
1. Check the air conditioner settings. Turn on Cooling Mode and set the fan speed to the highest level;
2. After running for 5 minutes, place your hand near the air outlet to feel if cool air is blowing. If cool air is present, the air conditioner is working normally. Cooling takes time to lower the room temperature;
3. If the issue remains after these checks, please request after-sales service for further inspection.

13. Q: What to do if the air volume from the Mijia Air Conditioner Pro Eco 3.5 kW air outlet is low?
A: If the air volume from the Mijia Air Conditioner Pro Eco 3.5 kW air outlet is low, please follow these steps:
1. Check the fan speed setting and set it to the highest level to see if the air volume improves;
2. Inspect the indoor unit filter for dirt or blockage. A clogged filter can reduce airflow. Clean the filter if necessary;
3. If the issue persists after these checks, please request after-sales service for inspection.

14. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW cannot start or power on?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW cannot start or power on, please follow these steps:
1. Check whether the power cord is properly connected;
2. Confirm whether the power outlet is working. If using a power strip, test it with another device. When the air conditioner receives power, it usually makes a beep sound indicating normal power supply;
3. Check if the remote control batteries are depleted. Replace them with new batteries and try again;
4. Use a phone camera to point at the remote control and see if an infrared signal is emitted. A red flashing light on the remote indicates the signal is working;
5. If connected to the Mi Home/Xiaomi Home APP, try to power on the air conditioner through the app;
6. If the issue remains after these steps, please request after-sales service for further inspection.

15. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW trips the circuit breaker during use?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW trips the circuit breaker during use, please follow these steps:
1. If the air conditioner trips the circuit breaker during use, please try enabling the ECO function to see if it operates normally. If the air conditioner works under this mode, the issue is due to power limitations;
2. If the problem still cannot be resolved, please request after-sales service for further inspection.

16. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW makes noise during operation?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW makes noise during operation, please follow these steps:
1. Identify the type of noise, for example, airflow sound, relay clicking sound, thermal expansion or contraction of plastic parts, compressor operation noise, or water flow sound. These are considered normal;
2. If there are external speakers nearby, they can produce noise due to electromagnetic interference after the air conditioner is turned on. Try adjusting the position of the external speakers;
3. If you hear other unusual sounds or the noise level is excessively loud, please contact after-sales service for inspection.

17. Q: What to do to prevent the Mijia Air Conditioner Pro Eco 3.5 kW from freezing?
A: To prevent the Mijia Air Conditioner Pro Eco 3.5 kW from freezing, please follow these steps:
1. When the air conditioner is operating in Cooling Mode, neither the indoor nor outdoor unit should freeze under normal conditions. If you notice ice forming on the indoor unit, please request after-sales service for inspection;
2. When operating in Heating Mode, it is normal for the outdoor unit to freeze slightly during regular operation. However, if the indoor unit freezes in Heating Mode, please also contact after-sales service for further inspection.

18. Q: What to do if the indoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW leaks water?
A: If the indoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW leaks water, please follow these steps:
1. Check if the indoor unit filter is too dirty. A clogged filter can reduce airflow, causing moisture buildup and leading to leakage. Clean the filter if necessary;
2. If you notice occasional water droplets around the air outlet, this is due to high humidity in the room. When warm humid air meets the cold surface, condensation may occur. This is a normal phenomenon. You can try closing windows and doors, increasing the set temperature, raising the fan speed, or activating swing mode;
3. If a large amount of water is leaking from the indoor unit, immediately turn off the air conditioner and disconnect the power. Wipe up any water and request after-sales service. Do not use the air conditioner again until it has been inspected by service personnel.

19. Q: What to do if the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW is leaking water?
A: If the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW appears to be leaking water, please consider the following:
1. When operating in Cooling Mode, the outdoor unit does not produce condensation. However, if water is observed dripping from the outdoor unit during cooling, it is usually due to condensation forming on the cold pipes. When outdoor humidity is high, moisture in the air condenses on the surface of low-temperature pipes. The resulting water then drips onto the base and drains through the outlet. This is a normal occurrence and does not require repair;
2. When operating in Heating Mode, the outdoor unit freezes, and the defrosting process naturally produces water. This is also normal;
3. It is also possible that residual rainwater is draining from the outlet after rainfall;
4. If you prefer a solution, request an after-sales service installation of a drainage nozzle or pipe on the outdoor unit.

20. Q: What to do if the remote control of the Mijia Air Conditioner Pro Eco 3.5 kW is not working or buttons are unresponsive?
A: If the remote control of the Mijia Air Conditioner Pro Eco 3.5 kW is not working or its buttons are unresponsive, please follow these steps:
1. Check whether the remote control batteries have sufficient power. Replace them if needed;
2. If the issue persists, try restarting the air conditioner by turning off the power and then turning it back on;
3. Check the surrounding environment for possible signal interference. Devices such as routers or high-power appliances placed nearby can affect signal transmission;
4. After installing new batteries, press and hold a button on the remote control. Use your phone’s camera to observe the front of the remote. If you can see a red flashing dot through the camera, it indicates that the remote is transmitting a signal;
5. If the problem still cannot be resolved, please request after-sales service for inspection.

21. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW emits an unpleasant odor during operation?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW emits an unpleasant odor during operation, please follow these steps:
1. If the air conditioner emits an unpleasant odor while operating, please check whether the filter is too dirty. Clean the filter thoroughly and observe whether the odor persists;
2. If the issue remains unresolved after cleaning, please request after-sales service for further inspection.

22. Q: What to do if the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW emits smoke during operation?
A: If you notice smoke coming from the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW during operation, immediately turn off the power and disconnect the air conditioner. Then, request after-sales service for professional inspection.

23. Q: What to do if the Auto Clean function of the Mijia Air Conditioner Pro Eco 3.5 kW cannot be used?
A: If the Auto Clean function of the Mijia Air Conditioner Pro Eco 3.5 kW cannot be used, please follow these steps:
Make sure you have correctly activated the Auto Clean function by pressing and holding the [ECO] and [Timer] buttons simultaneously for 3 seconds.
Please check whether the air conditioner is operating outside the allowed conditions for the Auto Clean function to start:
1. Indoor temperature is above 30℃ and outdoor temperature is above 40℃;
2. Indoor temperature is above 38℃;
3. Outdoor temperature is above 40℃;
4. Indoor temperature is below 16℃;
5. Outdoor temperature is below 0℃.
If the issue still cannot be resolved, please request after-sales service for inspection.

24. Q: What to do if the indoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW blows water or mist into the room?
A: If the indoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW blows water or mist into the room, please follow these steps:
1. If the indoor unit of the air conditioner blows water or mist into the room, this is usually caused by high indoor humidity. When cold air from the air conditioner encounters warm, humid air in the room, condensation occurs along the airflow path, resulting in mist or fine water droplets. In most cases, this is normal and does not require any special handling;
2. If the indoor humidity is particularly high and the temperature of the evaporator or connecting pipes is low, condensation continuously form on the panel or pipe surfaces. This is also considered a normal condition.

25. Q: What to do if there is an odor after unboxing the newly purchased Mijia Air Conditioner Pro Eco 3.5 kW?
A: If there is an odor after unboxing your new Mijia Air Conditioner Pro Eco 3.5 kW, please follow these steps:
1. Check whether the air conditioner was covered by other items for an extended period, which have caused dampness or mildew near the air outlet;
2. If the odor comes from the plastic parts of the indoor unit itself, this is a normal condition for a new appliance. The smell will fade on its own after some time. Please feel free to use the air conditioner as normal.

26. Q: What to do if a burning smell is detected while the Mijia Air Conditioner Pro Eco 3.5 kW is running?
A: If you notice a strong burning smell while using the Mijia Air Conditioner Pro Eco 3.5 kW, immediately turn off the power and stop using the device. Please request after-sales service for professional inspection.

27. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW has no power?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW does not power on, please follow these steps:
1. Check whether the power cord is properly connected;
2. Confirm that the power outlet is working. You can test it by plugging in another electrical appliance;
3. Listen for a beep sound when powering on the air conditioner. If you hear it, the device is receiving power normally;
4. If the issue still cannot be resolved, please request after-sales service for inspection.

28. Q: What to do if the air guide blade of the Mijia Air Conditioner Pro Eco 3.5 kW do not close properly?
A: If the air guide blade of the Mijia Air Conditioner Pro Eco 3.5 kW do not close properly, turn off the air conditioner and cut off the power supply. Wait for two minutes, then turn it back on and check if the air guide blade return to normal. If the issue persists, please request after-sales service for further inspection.

29. Q: What to do if the remote control of the Mijia Air Conditioner Pro Eco 3.5 kW does not display or displays incompletely?
A: If the remote control of the Mijia Air Conditioner Pro Eco 3.5 kW does not display or shows an incomplete screen, please follow these steps:
1. Check whether the remote control batteries are depleted. Replace them with new ones and try again;
2. Make sure the remote control is turned on. Press the power button and check if the display appears;
3. If the issue still cannot be resolved, please request after-sales service for inspection.

30. Q: What to do if the display panel of the Mijia Air Conditioner Pro Eco 3.5 kW does not show or only partially shows information?
A: If the display panel of the Mijia Air Conditioner Pro Eco 3.5 kW is not showing or only partially showing information, please follow these steps:
1. Use the remote control to turn on the display backlight by pressing the [Light] button;
2. Turn off the power to the air conditioner for two minutes, then restore power and check whether the display returns to normal;
3. If the issue remains unresolved, please request after-sales service for further inspection.

31. Q: What to do if the screen of the remote control for the Mijia Air Conditioner Pro Eco 3.5 kW is not lit?
A: The remote control of the Mijia Air Conditioner Pro Eco 3.5 kW does not have a backlight. If the numbers and icons are visible and functioning normally, it is normal for the screen not to light up.

32. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW displays an error code?
A: The error codes explanations and solutions are listed below:
Serial NumberError Code CategoryNew Error CodeError DefinitionError explanationSolution
1Sensor Fault ProtectionF1.1Indoor ambient temperature sensor failureIndoor unit ambient temperature sensing pack failure1. Find the corresponding sensor according to the displayed error code, re-plug the sensor, and confirm whether the sensor failure is caused by poor contact;
2. Use a multimeter to test the sensor resistance to detect whether there is a short circuit, open circuit, or whether the resistance value. Hold the temperature sensor with your hand and detect its resistance. If it gradually decreases, it is normal. If there is a fault, replace the corresponding sensor;
3. You can use the "debugging mode" to see whether the corresponding displayed temperature is normal for auxiliary judgment. If it displays "50" or "0" or "--" and flashes, it means that the sensor is abnormal.
2F1.2Outdoor ambient temperature sensor failureOutdoor unit ambient temperature sensing pack failure
3F2.1Indoor coil temperature sensor failureIndoor unit pipe temperature sensing pack failure
4F2.2Outdoor coil temperature sensor failureOutdoor unit pipe temperature sensing pack failure
5F2.3Indoor pipe temperature sensing pack failureIndoor unit pipe temperature sensing pack failure protection
6F2.4Outdoor pipe temperature sensing pack failure protectionOutdoor unit pipe temperature sensing pack failure protection
7F3.1Outdoor exhaust temperature sensor failureOutdoor unit exhaust temperature sensing pack failure
8F3.2Exhaust temperature sensing pack failure protectionOutdoor unit exhaust temperature sensing pack failure protection
9Electronic Control Hardware ErrorE1Outdoor EEPROM failureOutdoor unit electronic control program failure1. If you use an after-sales board, check whether the EEPROM parameters match;
2. Replace the outdoor unit electronic control board.
10E3Communication failure between the indoor unit board and the display boardCommunication failure between the indoor unit board and the display board1. Check the connection wires between the main board and the display board to ensure that the wire sequence and connection are reliable: replug and connect;
2. If the wires are normal, replace the indoor unit board or display board.
11E6.1Indoor and outdoor communication: Data cannot be received indoorsCommunication failure between the indoor and outdoor units main boards1. Eliminate communication failures caused by poor power supply and wiring;
2. Check unit connections;
3. Test and determine the voltage of the indoor unit;
4. Check the outdoor unit.
12E6.2Indoor and outdoor communication: Data cannot be received outdoorsCommunication failure between the indoor and outdoor units main boards
13E8.1Communication failure between the outdoor unit compressor chip and the fan chipOutdoor unit electronic control communication failureReplace the outdoor unit electrical control panel.
14E8.2Communication failure between indoor unit board and fan chipIndoor unit electronic control communication failureReplace the indoor unit electrical control panel.
15FFThe indoor unit cannot receive the Internet module (SOC, Wi-Fi) communication failureIndoor unit display panel communication failureRequest and replace the display board.
16Fan ErrorE0Indoor PG/DC fan failureIndoor unit fan failure1. Move the fan to confirm whether it is stuck. If the fan blade is stuck, remove it and reassemble it;
2. Check the circuit between the circuit board and the motor line. If the terminal is out of place, oxidized, or disconnected, reconnect it and ensure the connection is reliable;
3. Detect the resistance between the motor terminals. If it is abnormal, replace the motor;
Note: When replacing the motor, connect the new motor to the main board and test it. If it works normally, replace it. If it is abnormal, continue to check the main board.
4. If there is no problem with the above inspection, check the output voltage of the main board to confirm whether it is a main board problem. If there is a problem, replace it.
17E2 (E2.1/E2.2/E2.3/E2.4/E2.5/E2.6/E2.7)Outdoor DC fan failureOutdoor unit fan failure1. Move the fan to see if it is stuck. If so, reassemble or replace the deformed parts;
2. Check the circuit between the circuit board and the motor line. If the terminal is out of place, contact is poor, or circuit is disconnected, reconnect it reliably;
3. Detect the resistance between the motor terminals. If it is abnormal, replace the motor.
Note: Before replacing the motor, connect the new motor to the main board for testing. If the new motor runs normally, replace it. If it runs abnormally, check whether it is a main board problem.
18Outdoor Unit Electronic Control Drive ProtectionU0U0.0: Inverter DC over-voltage fault
U0.1: Inverter DC low voltage fault
U0.2:Inverter DC voltage mutation fault
U0.3:AC input low voltage (effective value) detection fault		Outdoor unit electronic control voltage failure1. First check whether the input voltage at both ends of the N and L lines on the white wiring terminal of the outdoor unit is within the normal allowable range (160V, 260V) and test it in the power-on state. If it exceeds this range, it is normal protection;
2. Check whether the grid voltage fluctuates greatly and has mutations, and restart the machine after a period of time;
3. If the voltage is normal, there is a problem with the voltage sampling circuit, and replace the outdoor electric control board.
Note:
Before replacing the outdoor main board, test whether the compressor is short-circuited to the copper pipe and whether the three-phase resistance is consistent.
19U1.1Inverter module fault/inverter module hardware over-current faultOutdoor unit electric control module current fault1. Check the compressor wiring, if the wiring is bad, rewire
2. Unplug the UVW line at the compressor end and re-power on. If the fault cannot be cleared, replace the outdoor unit electronic control;
3. If the impedance between the compressor phase line and the casing is too low, replace the compressor;
4. If the electronic control board is a common spare part, it could be that the electronic control and compressor parameters do not match, and the E-side program needs to be refreshed;
5. Replace the outdoor unit electronic control board;
6. Check whether the system condensing pressure is too high: abnormal fan (replace the motor), too much refrigerant (refill), capillary blockage (replace the capillary), dirty blockage inside the two devices (replace the two devices);
7. Replace the compressor.
20U1.2Outdoor current sensor failureOutdoor unit electric control current fault
21U1.3Compressor phase current circuit detection faultOutdoor unit compressor current fault
22U2(U2.1/U2.2/U2.3)Over-current protectionOutdoor unit electric control over-current protection1. Check if the voltage is too low;
2. Check if the outdoor unit heat exchanger is dirty or blocked; the outdoor unit does not exchange heat well in the grille
3. Check if the indoor/outdoor unit air outlet is not smooth;
4. Check if the indoor unit filter is dirty or blocked;
5. Check if the indoor/outdoor motor speed drops;
6. Check if the indoor/outdoor fan blades are damaged;
7. Check if the refrigerant is abnormal: After eliminating the actual current over-current protection, if the actual current is lower than the rated current and the protection is still on, the current detection circuit can be faulty, causing the detected current to be greater than the actual current value. Replace the outdoor unit electric control board.
In addition, if the protection code appears under high temperature and other conditions, the machine can operate properly, which is normal. The protection will be eliminated when the temperature drops.
23U3Drive initialization faultOutdoor unit drive start failure1. Check whether the main power supply voltages of the outdoor unit (DC310V, DC15V, DC12V, DC5V) are normal;
2. Replace the outdoor unit control board (if the abnormal voltage is caused by the electronic expansion valve coil or the DC fan, replace the electronic expansion valve coil or the DC fan).
24U4（U4.1/U4.2/U4.3/U4.4）Step loss detection/Compressor step loss protectionOutdoor unit compressor out-of-step protection1. System pressure imbalance, insufficient shutdown time-wait for 3-5 minutes before restarting;
2. Abnormal input voltage-use a voltage stabilizer;
3. Check whether the compressor wiring is properly connected and in the correct sequence-reconnect if necessary;
4. Faulty external fan motor-replace the motor;
5. Poor heat dissipation-clean the heat exchangers and improve the heat dissipation environment;
6. Control board phase sampling resistor value deviation or sampling circuit failure-replace the control board;
7. Excess refrigerant-recharge according to the required specifications;
8. Compressor failure (such as seizure, winding short circuit, or open circuit)-replace the compressor.
25U5Compressor phase loss/Reverse phase protectionOutdoor unit compressor missing/reverse phase protection
26U6.1Module temperature protectionOutdoor unit electronic control module temperature protection1. Check the voltage; it should be between 170V and 270V—use a voltage stabilizer;
2. Check if the outdoor unit heat exchanger is dirty or blocked—remove obstructions or clean the condenser;
3. Ensure smooth airflow from the outdoor unit-remove any obstructions;
4. Check if the outdoor unit motor speed has decreased or if the fan blades are damaged-replace the motor or fan blades if needed;
5. If the module temperature detection circuit is faulty-replace the outdoor unit control board.
27U6.2Module temperature sensor circuit faultThe temperature sensing pack of the outdoor unit electronic control module is faulty1. Check if the module board is making proper contact with the heat sink. Ensure tight, debris-free, and seamless contact between the module and the heat sink. Secure the module board screws properly. If needed, replace the outdoor unit control board;
2. Abnormal outdoor system or excessive compressor current—refer to U6.1;
3. Module temperature detection circuit failure—replace the outdoor unit control board.
28U8.1PFC hardware over-currentOutdoor unit electronic control PFC circuit over-current protection1. System pressure imbalance, insufficient shutdown time—wait for 3–5 minutes before restarting
2. Abnormal input voltage—use a voltage stabilizer;
3. Check if the compressor wiring is properly connected and in the correct sequence—reconnect if necessary;
4. Faulty outdoor fan motor-replace the motor;
5. Poor heat dissipation-clean the heat exchangers and improve the heat dissipation environment;
6. Control board phase sampling resistor deviation or sampling circuit failure-replace the control board;
7. Excess refrigerant-recharge according to the required specifications;
8. Compressor failure (such as seizure, winding short circuit, or open circuit)-replace the compressor.
29U8.2PFC software over-currentOutdoor unit electronic control PFC circuit over-current protection1. Sudden fluctuation in mains voltage—normal protection; use a voltage stabilizer;
2. Inductor (reactor) short circuit or PFC detection circuit failure-replace the outdoor unit control board.
30U8.3PFC RMS over-current protectionOutdoor unit electronic control PFC circuit over-current protection1. System pressure imbalance, insufficient shutdown time-wait for 3–5 minutes before restarting;
2. Abnormal input voltage—use a voltage stabilizer;
3. Check if the compressor wiring is properly connected and in the correct sequence-reconnect if necessary;
4. Faulty outdoor fan motor-replace the motor;
5. Poor heat dissipation-clean the heat exchangers and improve the heat dissipation environment;
6. Control board phase sampling resistor deviation or sampling circuit failure-replace the control board;
7. Excess refrigerant-recharge according to the required specifications;
8. Compressor failure (such as seizure, winding short circuit, or open circuit)-replace the compressor.
31Drive Limit Frequency Reduction (display 17)C1Module current (compressor phase current) protection limit/frequency reductionOutdoor unit electric control module current limit/frequency reduction1. Check if the voltage is too low; use a voltage stabilizer;
2. Check if the outdoor unit's heat exchanger is dirty or clogged; if the outdoor unit has poor heat dissipation due to being inside a grille: clean both heat exchangers and improve the heat dissipation environment;
3. Check if the airflow of the indoor/outdoor unit is obstructed; improve the heat dissipation environment;
4. Check if the indoor unit's filter is dirty or clogged; clean the filter and improve the heat dissipation environment;
5. Check if the rotation speed of the indoor/outdoor motor has decreased; replace the motor;
6. Check if the indoor/outdoor fan blades are damaged; replace the indoor and outdoor fans.
After excluding the actual current over-large protection, for example, if the actual current is lower than the rated current but the protection is still on, it may be due to a fault in the current detection circuit, causing the detected current to be greater than the actual current value. Replace the outdoor unit electronic control board.
32C2External AC current protection limit/frequency reductionOutdoor unit electric control AC current limit/frequency reduction
33C3Compressor module temperature limit frequency reductionOutdoor unit electric control module temperature limit/frequency reduction
34C4Whole machine current peak limit frequency reductionOutdoor unit electric control current peak limit/frequency reduction
35C5Drive protection limit/frequency reductionOutdoor unit electric control drive protection limit/frequency reduction
36System ProtectionP1Outdoor unit exhaust temperature over-high protectionOutdoor unit exhaust temperature over-high protection1. Check if the outdoor unit is operating under extreme high-temperature conditions. This protection is for the safety of the air conditioner;
2. Check if the outdoor unit is improperly installed, such as having obstructions at the air outlet, intense sun exposure, or poor ventilation. If so, adjust the installation position;
3. Check if the outdoor unit condenser or the indoor unit filter is dirty or blocked. If so, clean them promptly;
4. Check if the indoor and outdoor fans are not operating or running too slowly;
5. Check if the motor power supply circuit on the control board is normal, and if the motor capacitor is functioning properly. If not, replace the motor;
6. Check if the refrigeration system is clogged, and if the capillary tube is frosted and not melting. If so, replace the capillary tube or other clogged components;
7. Check if the system's operating pressure is normal (Connect a pressure gauge to measure the low-pressure side operating pressure. Normal cooling system pressure range is approximately 0.8-1.3MPa, and the normal heating system pressure range is approximately 2.0-3.6MPa) to determine if there is refrigerant leakage or air intake. If so, refill with the appropriate amount of R32 refrigerant;
8. Confirm if the exhaust temperature sensor is sensing the temperature correctly (resistance is normal). If the actual pipe temperature is low, and the detected temperature exceeds 100℃ (for example, after 30 minutes of shutdown, there is a significant difference between 15 and 14), compare the sensor's resistance with the resistance table. If the resistance is abnormal, replace the sensor;
9. If all the above checks are normal, replace the outdoor unit control board.
37P2Limit/Reduction frequency (display 17)  
38P2.1Exhaust protection limit/reduction frequencyOutdoor unit exhaust temperature over-high limit/reduction frequencyP2.1 Check according to P1
39P2.2Anti-freezing protection limit/reduction frequencyRefrigerant anti-freezing limit/reduction frequencyP2.2 Check according to P5
40P2.3Anti-condensation protection limit/reduction frequencyIndoor unit evaporator anti-condensation limit/reduction frequencyP2.3 Anti-condensation protection: When humidity is too high and the device is operating at low speed, reduce the frequency to prevent excessive condensation. This is a normal protection. Close windows and doors or adjust the fan speed to high.
41P2.4Power over-high limit/reduction frequencyOverall unit power over-high limit/reduction frequencyP2.4 Check according to U2
42P2.5Overload protection limit/reduction frequencyOverall unit overload limit/reduction frequencyP2.5 Heating overheat protection: Same as P4 or P6
43 P5Over-cooling protection in Cooling ModeEvaporator over-cooling protection in Cooling Mode1. Check if the indoor unit filter is clogged. If so, clean it;
2. Check if the indoor unit's air intake is blocked by foreign objects (curtains, paper, etc.). If so, remove the objects blocking the air intake;
3. Check if the indoor unit's cross-flow fan is stuck. If so, replace the bearings or fan, and tighten the fan screws;
4. Check if the indoor fan is not running or running too slowly;
5. Check if the motor power supply circuit on the control board is normal and whether the motor capacitor is functioning properly. If not, replace the motor;
6. The internal coil temperature sensor's IPT resistance can drift, causing the temperature sampled by the chip to deviate from the actual temperature. Replace the internal coil temperature sensor. Use the remote control to check the device's detected internal coil temperature with code 12. If the reading is significantly low (it shouldn't normally be lower than 5℃), replace the internal coil sensor. If the fault cannot be cleared, replace the indoor control board;
7. Check if the system's operating pressure is normal (Connect a pressure gauge to check the low-pressure side's operating pressure. The normal cooling system pressure range is about 0.8~1.3MPa). If there is refrigerant leakage, refill with the required amount of R32 refrigerant;
8. If all the above are normal, it can be an issue with indoor and outdoor communication data, and the indoor control board needs to be replaced.
44P8Outdoor unit high/low temperature protectionOutdoor unit high/low temperature protection1. Check if the outdoor ambient temperature is normal for cooling operation. If the ambient temperature is abnormal, it is normal protection. This occurs when the cooling temperature exceeds the protection range (low-temperature cooling is more likely to occur);
2. Observe if the outdoor unit is located in a confined or narrow space where heat dissipation is poor, causing the outdoor environment temperature to be too high or too low. If heat dissipation is confirmed to be poor, move the outdoor unit to ensure proper ventilation and heat dissipation;
3. If this code appears when the ambient temperature of the overall unit is within the normal range, it indicates that the outdoor ambient temperature sensor is faulty, resulting in inaccurate temperature sampling. First, replace the outdoor ambient temperature sensor. If replacing the sensor does not clear the fault, replace the outdoor power board.
45PARefrigerant shortage protection/abnormal refrigerant circulation protectionOverall unit refrigerant shortage protection/abnormal refrigerant circulation protection 

33. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW support filter cleaning reminders in the Mi Home/Xiaomi Home APP?
A: Yes, it does. After the Mijia Air Conditioner Pro Eco 3.5 kW has run for 500 hours, the Mi Home/Xiaomi Home APP will send a notification reminding you to clean the filter.

34. Q: Why do the heat exchanger fins of the Mijia Air Conditioner Pro Eco 3.5 kW get damaged?
A: 1. The fins of the Mijia Air Conditioner Pro Eco 3.5 kW are designed to be relatively thin and densely structured, contributing to their functionality. It is important to note that during the various stages of production and transportation, there may be rare instances of slight fin inversion occurring due to extreme conditions;
2. However, we would like to inform you that this minor inversion of the fins will not negatively impact the overall performance or efficiency of the air conditioner unit. Therefore, you can feel assured and confident in utilizing the air conditioner without concern regarding any potential effects of this phenomenon.
 
35. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW temperature is lower than the set temperature?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW is cooling below the set temperature, please check whether the room size is too small, which can cause the cold air to blow directly at you. The air conditioner is designed with a temperature compensation mechanism to enhance cooling performance, ensuring effective cooling even at a distance from the device.

36. Q: What to do if the display shows rotating lines after the Mijia Air Conditioner Pro Eco 3.5 kW is turned off and does not shut off automatically?
A: When the Mijia Air Conditioner Pro Eco 3.5 kW is turned off, if the evaporator temperature is still low and a large amount of condensate remains, the device will keep the indoor unit fan running for a while. This is to help dry the evaporator and prevent microbial growth or mold caused by prolonged moisture inside the sealed unit. The display shows rotating lines during this process and will turn off automatically afterward.

Installation Related
1. Q: Where is the connection pipe located on the indoor unit during installation of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: During installation of the Mijia Air Conditioner Pro Eco 3.5 kW, the connection pipe can be configured based on actual requirements. It supports left-side, right-side, or rear-side outlet options from the indoor unit. This flexible design allows for convenient installation in various room layouts.

2. Q: How much clearance is required for installation of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The following are the minimum clearance requirements for installing the Mijia Air Conditioner Pro Eco 3.5 kW:
Indoor unit:
1. Leave at least 15cm of space between the top of the indoor unit and the ceiling;
2. Leave at least 230cm of space between the bottom of the indoor unit and the floor;
3. If connection and drain pipes are installed on either side, make sure there are no obstructions within 15cm on that side.
Outdoor unit:
1. Leave at least 200cm of unobstructed space above the outdoor unit;
2. Leave at least 10cm of unobstructed space below the outdoor unit;
3. Leave at least 30cm of unobstructed space on the left side of the outdoor unit;
4. Leave at least 40cm of unobstructed space on the right side of the outdoor unit.

3. Q: What is the maximum height difference allowed between the indoor unit and the outdoor unit during installation of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The maximum allowable height difference between the indoor unit and outdoor unit during installation of the Mijia Air Conditioner Pro Eco 3.5 kW is 5 meters.

4. Q: How to install the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The Mijia Air Conditioner Pro Eco 3.5 kW must be installed before use. Installation requires professional skills. We recommend scheduling an on-site installation service. Self-installation is not recommended.

5. Q: What is the ideal location for installing the air conditioner? Are there any precautions to consider?
A: Installation of the Mijia Air Conditioner Pro Eco 3.5 kW requires a certain level of expertise. We recommend scheduling an on-site installation service rather than attempting to install the unit yourself.
The main installation locations are as follows:
Outdoor unit location selection:
1. Avoid exposure to direct sunlight or strong wind;
2. Keep away from heat sources, steam sources, and places with flammable gas leakage and smoke;
3. Select a place that is not exposed to rain and has good ventilation;
4. Choose a place where the air outlet and operating noise of the air conditioner will not disturb other people or animals, or plants;
5. Make sure the installation space is not smaller than the requirements in the lower left picture;
6. Make sure the air outlet is open and unobstructed to avoid affecting the performance;
7. The outdoor unit shall not occupy public sidewalks. If the outdoor unit is installed along buildings on both sides of the road, the distance from the bottom of the outdoor unit mounting bracket to the ground shall be greater than 25cm. On the condition that the outdoor unit mounting bracket does not affect the public passages, the distance from the bottom of the outdoor unit to the ground shall be greater than 25cm;
8. To ensure the room temperature regulation effect, it is recommended to remove the obstructions like the shutter in front of the outdoor unit when installing. If such obstructions cannot be removed, the air outlet of the outdoor unit shall be placed as close to the shutter as possible;
9. The installation location shall be firm and reliable. Otherwise, it will increase operating noise and vibration and bring danger.
Indoor unit location selection:
1. Avoid direct sunlight;
2. There are no obstacles at the air inlet and outlet to maintain good air circulation;
3. It is convenient for the drainage pipe to drain water;
4. The distance to radio devices (such as TV or radio) is greater than 1m;
5. The air conditioner shall be installed on a wall that can bear the indoor unit's weight and does not increase the operating noise and vibration;
6. The minimum clearance between the auxiliary electric heating air conditioners and the surface's combustible materials is 1.5m;
7. The auxiliary electric heating components are assembled and fixed in the indoor unit evaporator. They are ceramic PTC electric heating elements. The input power can be found in the "input Power for the Auxiliary Electric Heater (PTC)" on the nameplate (models without "input Power for the Auxiliary Electric Heater (PTC)" on the nameplate do not have this component).
Note:
To install the indoor and outdoor units according to the spacing shown in the User Manual to achieve better results.

6. Q: What are the dimensions of the connection pipes (inner and outer diameters of the high-pressure and low-pressure pipes) for the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The copper connection pipe diameters for the Mijia Air Conditioner Pro Eco 3.5 kW are Φ6mm and Φ9mm. The Φ6mm pipe has an outer diameter of 6.35mm and a wall thickness of 0.6 or 0.7mm. The Φ9 pipe has an outer diameter of 9.52mm and a wall thickness of 0.7mm.

7. Q: What is the maximum extension length of the connection pipes for the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The maximum length of the connection pipes for the Mijia Air Conditioner Pro Eco 3.5 kW is 10 meters. When the pipe length exceeds 7 meters, additional refrigerant (15g per meter) must be added to avoid affecting the cooling performance.

8. Q: Can the Mijia Air Conditioner Pro Eco 3.5 kW be used with a drainage pump?
A: To use a drainage pump with the Mijia Air Conditioner Pro Eco 3.5 kW, please follow these steps:
1. The air conditioner comes with a drainage pipe that allows for natural drainage during installation, so an additional drainage pump is not required;
2. However, if there is no drainage outlet in the room, a drainage pump can be installed. Please make sure that the end of the drainage pipe is not submerged in water.

Cleaning and Maintenance
1. Q: Does the filter of the Mijia Air Conditioner Pro Eco 3.5 kW need to be replaced regularly?
A: For the Mijia Air Conditioner Pro Eco 3.5 kW, if the filter is not damaged or deformed, there is no need to replace it.

2. Q: How to clean the evaporator of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: To clean the evaporator of the Mijia Air Conditioner Pro Eco 3.5 kW, first power off the air conditioner and remove the indoor unit's front panel. Spray a suitable cleaning agent onto the evaporator fins, wait for 5-10 minutes, then rinse thoroughly with clean water. During the cleaning process, avoid letting water enter the control box or display panel terminals, as this will cause electrical failures.
If you use the Auto Clean mode for cleaning, please follow the instructions for that mode. Since cleaning the evaporator requires disassembling the front panel, it is not recommended to perform this operation by yourself.

3. Q: How often should the Auto Clean function of the Mijia Air Conditioner Pro Eco 3.5 kW be used?
A: For the Mijia Air Conditioner Pro Eco 3.5 kW, it is recommended to run the Auto Clean function once a month. If the operating environment is poor, such as in areas with a lot of dust, the interval should be shortened accordingly.

4. Q: What to do if the Auto Clean function of the Mijia Air Conditioner Pro Eco 3.5 kW fails or performs poorly?
A: If the Auto Clean function of the Mijia Air Conditioner Pro Eco 3.5 kW fails or the cleaning effect is unsatisfactory, please follow these steps:
1. After activating the Auto Clean mode, the air conditioner should complete the entire cleaning process. The Auto Clean cycle takes around 30 to 40 minutes, with slight variations depending on the operating environment. Please ensure the process finishes automatically;
2. During Auto Clean, if the temperature is too high or too low, the air conditioner enter protection mode and exit cleaning early. It is recommended to start the Auto Clean function under moderate temperature conditions to avoid interruptions;
3. During the Auto Clean process, you will notice unusual sounds, reduced airflow from the indoor unit, or blowing cold or warm air. These are signs that the cleaning is proceeding normally. To reduce discomfort, keep the room ventilated.
The Auto Clean mode cannot start if the environment is outside the following temperature ranges:
1. Indoor temperature exceeds 30℃ and outdoor temperature exceeds 40℃;
2. Indoor temperature exceeds 38℃;
3. Outdoor temperature exceeds 40℃;
4. Indoor temperature is below 16℃;
5. Outdoor temperature is below 0℃.
Note:
If you press the power off button during the Auto Clean process, the function will not stop immediately. It will exit based on the current cycle stage. Choose the appropriate time to end or complete the process to avoid damaging the air conditioner.

5. Q: How to clean the filter of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: To clean the filter of the Mijia Air Conditioner Pro Eco 3.5 kW, please follow these steps:
1. To remove the filter, open the clips at both ends and the middle of the filter, and pull upward to remove the filter;
2. After the filter is removed, use a vacuum cleaner to remove the dust or rinse the filter with clean water. If the filter is dirty, clean it with neutral detergent or soapy water, then rinse it with clean water and put it in a cool place to dry;
3. To reinstall the filter, align the clips with the snapping positions and reinstall the filter correctly.


6. Q: How to clean the Mijia Air Conditioner Pro Eco 3.5 kW, and how often should it be done?
A: For the Mijia Air Conditioner Pro Eco 3.5 kW, it is recommended to have the internal components professionally cleaned once a year to ensure optimal performance.
As for the exterior, you can clean it yourself by following these steps:
Warning of cleaning the indoor unit:
1. Before performing the care and maintenance on the air conditioner, make sure the air conditioner is turned off and the power supply is cut off;
2. When performing the care and maintenance on the air conditioner, avoid accidents such as tumbling or falling to avoid injury;
3. After removing the indoor unit panel, do not touch the metal fins of the heat exchanger to avoid injury;
4. Do not clean this product with water. If water gets into the indoor unit, malfunction or electric shocks may occur;
5. Do not use chemicals or solvents such as alcohol, gasoline, lacquer thinner
, polishing powder, essential balm, toothpaste or laundry detergent to clean any parts of this product to avoid damage;
6. After cleaning, make sure all parts are completely dry before installing and using them. Avoid direct sunlight.
Cleaning the air conditioner body:
Use a soft cloth or sponge dipped in clean water or diluted neutral detergent to wipe the surface of the air conditioner body.
Note:
1. Do not apply excessive force when cleaning the indoor unit panel to avoid damage;
2. Do not wipe the panel and remote control casing with wire cleaning balls, brushes, etc. to avoid damaging the casing.

Heating Related
1. Q: What is the heating power of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The heating power of the Mijia Air Conditioner Pro Eco 3.5 kW is 860W.

2. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW support electric auxiliary heating?
A: The Mijia Air Conditioner Pro Eco 3.5 kW does not support electric auxiliary heating.

3. Q: What is the operating temperature range for heating with the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The heating function of the Mijia Air Conditioner Pro Eco 3.5 kW operates within a temperature range of -20℃ to 24℃.

4. Q: What is the applicable room size for heating with the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The applicable room size for heating with the Mijia Air Conditioner Pro Eco 3.5 kW is 15 to 25 square meters.

5. Q: What is the rated heating capacity of the Mijia Air Conditioner Pro Eco 3.5 kW?
A: The rated heating capacity of the Mijia Air Conditioner Pro Eco 3.5 kW is 2600W.

6. Q: Does the Mijia Air Conditioner Pro Eco 3.5 kW support automatic defrosting?
A: Yes, the Mijia Air Conditioner Pro Eco 3.5 kW supports automatic defrosting.

7. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW is not heating?
A: If the Mijia Air Conditioner Pro Eco 3.5 kW does not blow air or only blows natural (unheated) air after powering on, it indicates a heating issue and an on-site inspection by a technician is recommended.
Before requesting service, please check the following:
1. The air conditioner has a built-in preheating function. It will not blow air immediately after entering Heating Mode. Wait a few minutes to see if warm air starts coming out;
2. Make sure doors and windows are properly closed to prevent cold air from affecting the heating performance;
3. Confirm that the outdoor unit is installed in a well-ventilated area to ensure proper heat exchange;
4. If the issue persists, please request after-sales service for further inspection.
Note:
If the air conditioner is blowing warm air but the heating effect is weak, let it run for about 5 minutes and observe it, and refer to the principle of the defrost function to avoid misjudgment.

8. Q: What to do if the heating performance of the Mijia Air Conditioner Pro Eco 3.5 kW is poor?
A: If the heating performance of the Mijia Air Conditioner Pro Eco 3.5 kW is poor, please follow these steps:
1. Please make sure the air conditioner model is suitable for the room, and avoid frequently opening or closing doors and windows;
2. Clean the air filter regularly to prevent blockage, and check that the air inlet is not obstructed. Make sure the airflow from the outlet is strong;
3. Set the fan speed to level 5 or higher (high speed), and adjust the air deflector to blow downward;
4. Keep the room sealed by closing all doors and windows. Be aware that heating efficiency will significantly decrease when the outdoor temperature falls below -7℃;
5. Switch to Heating Mode and set the temperature higher than the current room temperature (e.g., 31℃). Let it run for at least 5 minutes to observe changes;
6. Check if the defrosting function has been activated. The air conditioner pauses heating for about 10 minutes every 30 to 60 minutes during defrosting;
7. If the air conditioner fails to operate normally or if the issue persists, it is recommended to request after-sales service for further inspection.

9. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW does not blow air after switching to Heating Mode?
A: If the air conditioner does not blow air after entering Heating Mode, the possible reasons are as follows:
1. The air conditioner has just been turned on and is in cold air protection mode. Please wait patiently for the device to start heating normally;
2. The air conditioner is in defrosting mode. Wait until the defrosting process finishes for airflow to resume;
3. If the device still does not blow air after a period of time, please request after-sales service for inspection.

10. Q: What to do if the Mijia Air Conditioner Pro Eco 3.5 kW automatically stops working during heating?
A: During heating, the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW will periodically stop to perform defrosting, this is a normal behavior. The device will restart automatically after defrosting. If the air conditioner does not resume operation by itself, please request after-sales service for inspection.

11. Q: What to do if the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW emits white smoke during heating?
A: If white smoke is observed coming from the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW, immediately power off the device and request after-sales service for inspection.

12. Q: What to do if water flows from the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW during heating?
A: Water flowing from the outdoor unit of the Mijia Air Conditioner Pro Eco 3.5 kW is caused by the defrosting process and is a normal phenomenon that requires no action.

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