Xiaomi Smart Air Purifier 4 FAQ

Overview
1. Q: What is the introduction of Xiaomi Smart Air Purifier 4?
A: Xiaomi Smart Air Purifier 4 comes standard with Xiaomi Smart Air Purifier 4, Filter, and Power cable.
The structure and function include grille, flip cover (from which the grille is removed), display screen, mode switch button, power button, temperature and humidity sensor, display switch button, laser particle sensor, filter compartment door, power port

2. Q: What information does the Xiaomi Smart Air Purifier 4 display contain?
A: The display can show temperature, humidity, air quality status light, PM2.5 value, operating mode, Wifi indicator, negative ion indicator. The buttons include the power button and the mode switch button (the buttons do not support turning off).
3. Q: How to place Xiaomi Smart Air Purifier 4?
A: In order to better exert the performance of the air purifier, the air inlet of the main unit should be kept at a certain distance from the wall and other obstructions during use (refer to the following figure for details).

4. Q: How does Xiaomi Smart Air Purifier 4 connect to the power supply?
A: Connect the power cord to the power port on the bottom of the main unit, and then connect to the power supply.


Product introduction and use
1. Q: How to turn on and off the Xiaomi Smart Air Purifier 4?
A: Touch the power button to turn it on. When powered on, touch the power button to power off.

When connected to the APP, enter the plug-in and click on/off to switch the machine on and off.
2. Q: How to switch modes on Xiaomi Smart Air Purifier 4?
A: In the power-on state, touch the mode switch button to cycle through automatic, sleep, gear, and favorite running modes.

When connected to the APP, enter the plug-in and click Auto/Sleep/Favorite/Gear to switch the mode.
3.Q: How to adjust the display brightness of Xiaomi Smart Air Purifier 4?
A: Short press the display on/off key to adjust the brightness of the display cyclically: normal, slightly bright, and off screen.

When connected to the APP, enter the plug-in and click the brightness of the display screen to adjust the screen off/slightly bright/normal brightness
4. Q: How to switch the child lock on Xiaomi Smart Air Purifier 4?
A: Press and hold the mode switch button for 7 seconds to turn the child lock on or off. The purifier emits the corresponding prompt sound, and the display screen displays the corresponding icon.
When the child lock function is on, the buttons are disabled.
When connected to the APP, enter the plug-in and click the child lock to enable the child lock to be turned on and off. After it is turned on, only the APP can be used to control the purifier.
5. Q: How to clean the fan blades and air duct of Xiaomi Smart Air Purifier 4?
A:
1. Press the concave point on the flip cover to open the flip cover. Loosen the screws with a screwdriver and pull up on the flap to remove the grille.
2. Use a vacuum cleaner to clean the dust attached to the air duct and fan blades, or wipe gently with a soft cloth.
3. Gently wipe the negative ion emitter with a brush or soft cloth.
4. After cleaning is complete, replace the grille.
Tip: The screws that fix the grille are non-protruding screws. In order to avoid loss, they cannot be removed, and the grille can be removed by loosening it.

6. Q: How to clean the filter compartment of Xiaomi Smart Air Purifier 4?
A: In order to ensure the ventilation and purification effect, you can use a vacuum cleaner to clean the dust attached to the air inlet hole and the warehouse wall, or gently wipe it with a soft cloth
.
Note: Do not directly rinse, spray with water or wipe the filter compartment with a wet cloth with dripping water, so as not to damage the machine.
7. Q: How does Xiaomi Smart Air Purifier 4 clean the laser particle sensor?
A: Use a non-sharp tool to open the door of the laser particle sensor, and use an air gun or a blower to clean the door filter and sensor.
Note: Do not use hot air.

8. Q: What motor does Xiaomi Smart Air Purifier 4 use?
A: Xiaomi Smart Air Purifier 4 uses DC brushless motor, supports stepless speed regulation, low noise, long life, the maximum noise of the whole machine is ≤62dB(A), and sleep mode can be turned on when sleeping.
9. Q: What is the upper position of the back of Xiaomi Smart Air Purifier 4?
A: The position at the top of the back is the laser particle sensor, whose main function is to monitor the PM2.5 content in the ambient air.
10. Q: Can Xiaomi Smart Air Purifier 4 be placed sideways?
A: It is not recommended to place it horizontally. In order to form the maximum air circulation in the use space, let clean air blow all over the corner, and ensure the best purification effect, it is recommended to place the purifier vertically, and keep a distance of at least 10CM from the back of the machine (there is a laser particle sensor on the back). Keep a space of 20CM on the side and front (avoid blocking the air inlet). Placing the purifier horizontally will hinder the air circulation, resulting in poor purification effect.
11. Q: Will the humidifier affect the PM2.5 value of Xiaomi Smart Air Purifier 4?
A: Yes. Ultrasonic humidifiers atomize water into tiny water particles with high concentrations. The sensor of Xiaomi Smart Air Purifier 4 is very sensitive and can detect tiny water particles, so the detection reading will be high or even burst. When the humidifier is turned off, the reading will slowly return to normal. This is normal.
12. Q: Why does the button on Xiaomi Smart Air Purifier 4 fail?
A: Xiaomi Smart Air Purifier 4 has a "child lock" function on the "Mi Home" APP. If the child lock is turned on, pressing the button on the purifier will invalidate it. At this time, the child lock function needs to be released, and then the buttons can be operated on the purifier. Turning off the power and re-powering on or resetting the WIFI will also release the child lock.
13. Q: How to turn off/on the display on Xiaomi Smart Air Purifier 4?
A: There is a light brightness adjustment button on the back of Xiaomi Smart Air Purifier 4. Each time you press the button, the screen brightness will switch between high brightness, low brightness, and off. If the "Mi Home" APP is connected, find and click the device, then swipe down to find and click "Purifier Light", you can also adjust the brightness of the control screen.
14. Q: What filter does Xiaomi Smart Air Purifier 4 come with as standard?
A: The standard Filter of Xiaomi Smart Air Purifier 4 is a combination of antibacterial and antiviral high-quality filter and activated carbon filter, which is an integrated high-quality filter.
15. Q: What do the different colors of the air quality status light mean?
A: The air quality status light corresponds to three colors of green, orange and red with the change of PM2.5 value.
Green: PM2.5 at 1-75μg/m³
Orange: 76—150μg/m³
Red: >150μg/m³
16. Q: Why does the air quality status light occasionally jump?
A: The air quality status indicator of Xiaomi Smart Air Purifier 4 is an intuitive response to PM2.5 concentration, and changes in color as the air quality data changes. When the value jumps at the critical point, the color of the indicator light will also change with the corresponding value.
17. Q: How is the lifespan of Xiaomi Smart Air Purifier 4Filter calculated?
A: Xiaomi Smart Air Purifier 4 will automatically and comprehensively calculate the service life of the Filter according to the air quality of the use environment, the purifier operating mode, operating speed and time. If the air quality of the purifier is poor, the filter life will be shorter; if the air quality is better, the filter life will be longer. Overall, the filter life is about 6 to 9 months.
18. Q: How often does Xiaomi Smart Air Purifier 4 usually replace the Filter?
A: If the purifier is in poor air quality, the filter life will be shorter; if the air quality is better, the filter life will be longer. Overall, the filter life is about 3 to 6 months. If the filter life recorded by the purifier is less than or equal to 10%, the user will be reminded to recommend replacement from the display screen and APP, and one-click purchase on the mobile phone is supported.
19. Q: Precautions for the use of formaldehyde removal filter?
A: Activated carbon products will adsorb formaldehyde, toluene, ammonia, TVOC, etc. The Filter activated carbon used by Xiaomi Smart Air Purifier 4 is a catalyst activated carbon, which has a certain adsorption and neutralization effect on formaldehyde. However, the correct way to use it is to take out the filter element for a period of time (about 1 month) and ventilate it for relief. If the environment is not good, it will interval to be shortened. Otherwise, there will be a risk of secondary pollution.
20.Q: What should I do if the formaldehyde removal filter is not effective?
A: The formaldehyde removal filter uses catalytic activated carbon, which mainly has a strong adsorption and reaction to formaldehyde. If the purifiers on the market now use granular carbon to remove formaldehyde, they basically belong to this category. The use of activated carbon to remove formaldehyde is mainly to use the adsorption effect of activated carbon, through the repeated filtration of indoor air by the purifier, to adsorb formaldehyde in the air to achieve the effect of purification. This method is very scientific and environmentally friendly, and will not derive other components that are harmful to the human body. Formaldehyde is a slow-release gaseous pollutant. It is not released at one time, but is released slowly, even for several years. When the indoor temperature is higher than 19 degrees Celsius, formaldehyde will volatilize faster, and as the temperature rises, formaldehyde will volatilize faster. high, the volatilization rate will be accelerated. Safe filtration of formaldehyde requires a process. If the customer is in a closed space and opens the purifier for filtration, if it is 0.45 before filtration and 0.5 after opening overnight, it may be that the concentration of this closed space is too high. If it does not pass through the purifier overnight Filtration, the formaldehyde concentration may be much higher than 0.5. In addition, the instrument used by the customer to detect the formaldehyde concentration also needs to be considered. As for the embodiment of the more intuitive filtering effect, at this stage, our purifier can not reflect it.
If it is found through accurate detection that the effect of the purifier in removing formaldehyde is not satisfactory, it is very likely that there is a source of pollution that continuously releases formaldehyde in the confined space environment. Prolonged ventilation is recommended.
21. Q: Does Xiaomi Smart Air Purifier 4 smell bad?
A: The purifier and the filter itself have no source of odor. After the new filter is used, it needs to filter PM2.5 and other pollutants in the air. The filter absorbs more pollutants, has been used for a long time, and the environment is relatively humid, etc. It is possible to produce peculiar odors in this case. At this time, the Filter needs to be ventilated and dried outdoors to relieve it, but it cannot be restored to the new state. This phenomenon is normal.
22.Q: Does Xiaomi Smart Air Purifier 4 Filter need to be reset after the replacement expires?
Core life?
A: Xiaomi Smart Air Purifier 4 has an RFID tag module, when a new filter is replaced, there is no need to manually reset the filter life.
23.Q: Why does Xiaomi Smart Air Purifier 4 have poor purification effect?
A: Please check whether the area of use environment is consistent with the adaptable area and gear position of the machine. The airtightness and height of the room will also affect the purification effect.
24.Q: Why is the value of PM2.5 high, and it is higher indoors than outdoors?
A: The water mist and oil fume generated by using a humidifier indoors, smoking, cooking, etc., will affect the purifier's judgment of the pollution value. At the same time, the outdoor value in the APP will be different from the actual value in local areas.
25.Q: Why does the PM2.5 value of Mijia Air Purifier 4 also change when running without a filter element?
Without a filter element, PM2.5 may drop or rise. It is related to the use environment. Without a filter element, it is equivalent to a fan, which will make the indoor air circulate and mix the indoor air with high or low PM2.5 concentration. During this period, the air PM2.5 detected by the sensor is random. After a long time, the concentration of PM2.5 in the air tends to be uniform, and the sensor value will also tend to be stable.
26.Q: Will the life of Xiaomi Smart Air Purifier 4 decrease without changing the filter?
A: Without a filter element, filter life will not decrease. The life of the filter element is calculated automatically by the machine according to the air quality, operating state and operating time, and is written into the label, so the life of the filter element will not be reduced if the filter element is not installed in the running state.
27. Q: Will the humidity of the room decrease when the air purifier is turned on for a long time?
A: Yes, because the purifier will filter the particulate matter in the air and also filter the water vapor in the air, it will reduce the ambient air humidity, which is a normal phenomenon. Water molecules will attach to the filter material and activated carbon, resulting in lower humidity, interference with the performance of the purifier and deviations in the displayed particle value.
28.Q: Can the air purifier remove odors such as oil fume?
A: Yes, but depending on the environment, it usually takes a long time for purification to be effective. At the same time, the amount of activated carbon filter and the length of time the filter has been used will affect the effect of purifying odors.

29.Q: Does Xiaomi Smart Air Purifier 4 have ion function?

A: Yes, the ion function is turned on by default, and it needs to be turned on or off through the Mi Home APP after the machine is connected to the Internet. After the ion function is turned on, the ion indicator on the screen lights up, and the product regularly releases negative ions during operation, and the negative ions combine with oxygen to form a
form negative oxygen ions to assist in the removal of pollutants in the air. After the normal environment is opened, ordinary people can't feel it.

Mi Home APP related
1. Q: Xiaomi Smart Air Purifier 4 networking precautions?
A: Xiaomi Smart Air Purifier 4 supports network control and is compatible with most personal routers on the market.
It should be noted that the wireless network of the router has the following requirements:
1. Xiaomi Smart Air Purifier 4 can only connect to 2.4GWifi network; 5GWifi is not supported;
2. The Wifi encryption method needs to be WPA, WPA2, WEP is not supported;
3. The router needs to enable DHCP. It does not support specifying static IP, web authentication and 802.1X for enterprises.
(The "Mi Home" APP needs to be downloaded to control Xiaomi Smart Air Purifier 4).
2. Q: How to remotely control Xiaomi Smart Air Purifier 4 with a mobile phone?
A: Use the mobile phone to scan the QR code on the manual or install the "Mi Home" APP through the Xiaomi app store, and bind the Xiaomi account to ensure that the Wifi at home can be connected to the Internet normally, the mobile phone is connected to the Wifi, turn on the purifier, and open the "Mi Home" APP. Home” APP, the APP will automatically search for nearby Xiaomi smart devices and prompt, or click the plus sign in the upper right corner to manually add devices. After adding Xiaomi Smart Air Purifier 4 according to the prompts, you can control the purifier on/off, switch the operating mode, check the current indoor air quality, temperature and humidity, etc. through the mobile APP.
3. Q: How to reset wifi on Xiaomi Smart Air Purifier 4?
A: When connecting to the APP for the first time or unable to connect to the APP, press and hold the display key on the back of the fuselage for 7 seconds, the purifier will make a sound, and the Wifi has been reset successfully


4. Q: Xiaomi Smart Air Purifier 4 keeps showing offline or unable to connect to Wifi in the APP, how to solve it?
A:
1. Confirm whether Xiaomi Smart Air Purifier 4 is powered on and running normally;
2. Confirm whether the Wifi is normal;
3. Please unplug the power cord, and then turn it on after 10 seconds (the power needs to be discharged for a while), try to reset the Wifi of Xiaomi Smart Air Purifier 4, and reconnect to the Wifi.
5. Q: What is the favorite mode?
A: The so-called favorite mode, that is, users can set the speed of the purifier fan through the Mi Home App according to their own needs, and can adjust the speed steplessly to adapt to the use area to achieve the customer's favorite purification effect.
6. Q: Does Xiaomi Smart Air Purifier 4 support Smooth Connect?
A: Xiaomi Smart Air Purifier 4 does not support Smooth Connect. You can check whether the Mi Home APP module in the manual has the Xiaomi Fun Connect logo, and whether the fuselage has the Fun Connect QR code can be confirmed.
7.Q: How to turn off the sound of the air purifier?
A: When connected to the APP, enter the plug-in and click on the prompt tone to turn on and off the prompt tone.

FAQ and Troubleshooting
1. Q: Xiaomi Smart Air Purifier 4 cannot be turned on?
A: 1. First confirm that the socket is powered, and then confirm whether the power cord is properly inserted.
2. After the power cord is powered on, the machine will beep and the screen will display the Xiaomi LOGO and then turn off. At this time, press the switch button again.
Can start normally.
3. If the machine beeps and the screen displays a prompt that the door is not closed or the top grille is not closed, it means that the machine is powered on.
Often, the top grille or filter hatch is not in place and will need to be reinstalled.
2. Q: Are there vertical lines on the display of Xiaomi Smart Air Purifier 4?
A: If the phenomenon persists after power off for more than 10 seconds and then plugged in again, the display screen has a performance failure and needs to be contacted for after-sales inspection.
3. Q: The screen of Xiaomi Smart Air Purifier 4 shows that the filter door is not closed?
A: Check whether the filter door is closed tightly, reassemble and power off for 10 seconds to restart. If the above is invalid, please contact the after-sales inspection.
4. Q: The top grille of Xiaomi Smart Air Purifier 4 is not closed?
A: Check whether the top grille is closed tightly, reassemble and power off for 10 seconds. If the above is invalid, please contact the after-sales inspection.
5. Q: Xiaomi Smart Air Purifier 4 prompts motor failure?
A: Check whether the Filter is installed in place and reinstall the Filter;
Check whether there are foreign objects at the fan that cause the motor to be blocked or abnormal, and restart after 10 seconds of power failure.

6.Q: What should I do if the PM2.5 value is displayed abnormally or not on time?

A: When the PM2.5 value display is inaccurate or abnormal, you can check whether the door of the laser particle sensor on the back of the fuselage is dirty and blocked. If it is clogged with dirt, open the laser particle sensor door with a non-sharp tool, use an air gun or blower
(Do not use hot air.) The filter and sensor on the door can be cleaned. Use a waste toothbrush dipped in clean water to gently scrub the filter of the laser particle sensor door, clean it and dry it before putting it back for testing. If the cleaning is invalid, please contact the after-sales service, and professional after-sales technicians will handle it. The values ​of multiple air cleaners in the same environment are different, and the values ​will also be different due to environmental factors such as different heights. It can be tested in sleep mode and with different levels of smoke. If the error value increases linearly, it means that the laser particle sensor is faulty. If the error value is within a certain range, it means it is normal.

7. Q: Why is there a current sound when Xiaomi Smart Air Purifier 4 is turned off?

A: This sound is the current sound produced by the inductor on the DC-DC circuit. Since the motherboard needs to convert the 24V voltage into 5V or 3.3V voltage, it needs to constantly switch the inductor at high frequency, and the inductor has been converting electrical energy into a magnetic field energy, and then convert the magnetic field energy into electrical energy. This energy conversion will cause the inductor to generate a slight current sound, which is a normal phenomenon.
8. Q: Why sometimes the fan of the purifier laser particle sensor does not turn?
A: The boot screen is displayed normally, the sensor is always working, and the value is displayed in real time. When the display is off, in order to reduce the use time of the sensor and increase the service life, the sensor will start every 2 minutes and continue to work for 12-15 seconds. The sensor will continue to work when the APP is open, and the sensor will work intermittently after the APP is closed and the screen is turned off for 5 minutes.
9. Q: How to deal with the abnormal noise of Xiaomi Smart Air Purifier 4?
A:1. If there is abnormal noise during work, firstly check whether the filter installation is normal and whether the filter bag is removed;
2. Next, check whether there are foreign objects entering the purifier. If any foreign objects fall into the purifier, open the filter compartment and take out the foreign objects.
3. Check whether there is foreign matter entering the laser particle sensor.
10. Q: When multiple air purifiers are used in the same environment, why are the air quality status lights displayed in different colors?
A: First of all, in the actual environment, since dust will flow with the flow of air, it is difficult to ensure that the dust value in any two places is the same even in the same small room, and Xiaomi Smart Air Purifier 4 sensor sensitivity Very high, so there will be differences as well. PM2.5 difference between two air purifiers (difference calculation method: (average-reading)/average), within 10% is a normal phenomenon. Second, any electronic device is subject to tolerances, which can cause differences in sensor-related voltages, which in turn cause differences in sensor output values. If the PM2.5 readings of the two purifiers are quite different, there may be dust accumulation on the sensor door. You can remove the sensor door to clean the dust. The colors of the air quality indicators of the two purifiers are different in the same environment. As mentioned above, due to the difference in PM2.5, the values ​​detected by the two sensors are both near the critical value, one is above the critical value, and the other is at the critical value. Under the air quality indicator, the color of the air quality indicator is different
11. Q: Why does it prompt to use the genuine filter after replacing the filter?
A: Xiaomi Smart Air Purifier 4 has an RFID tag module. When a new genuine filter with an RFID tag is replaced, the life of each filter can be accurately identified without the need to manually reset the filter life. When the new genuine filter is installed and the prompt to install the genuine filter appears, please confirm whether the original genuine filter is used, check whether the filter installation position is in place, reinstall the filter, power off for 10 seconds and restart. If the above is invalid, please contact the after-sales inspection.
12. Q: Can Xiaomi Smart Air Purifier 4 be retrofitted?
A: No. There are other third-party purifier accessories to change the way the purifier itself is used, and they cannot be used in combination with purifier products. For example, connect the outdoor air to the purifier Filter through a pipe, or add a humidifier to the air outlet of the machine etc., once the modification is used, it may affect the performance, stability and safety of the product. Therefore, it is forbidden to change the original usage mode of the purifier.