Xiaomi Smart Air Purifier 4 Pro FAQ
1.Q: What type of motor does the Xiaomi Smart Air Purifier 4 Pro use and does it make much noise?
A: The purifier uses a low-noise, durable brushless DC motor that supports stepless speed control. The unit's maximum decibel level is ≤ 64 dB (A) and it can be switched to sleep mode when you are sleeping.
2.Q: What is the part on the upper back of the air purifier?
A: This is a particulate matter (PM) laser sensor. Its main function is to monitor PM2.5 concentration in the air.
3.Q: What should I do if the purifier cannot be powered on?
A: First, ensure the electricity outlet works properly, and the power cord is properly connected. If everything above is normal, when you turn the power on, you should hear a beep, and the Xiaomi logo should appear on the display and then disappear. Then, press the On/Off button to turn on the purifier. If you hear a beep and see a prompt displayed on the display, indicating that the cover or the top grille is not closed, the purifier is properly powered but the top grille or filter cover is not properly installed. Please reinstall the top grille or filter cover.
4.Q: The display is showing vertical lines, what has gone wrong?
A: Power down the purifier, then power it back on after at least 10 seconds. If the problem persists, the display is faulty. In this case, please contact after-sales service.
5.Q: What should I do if a prompt is shown on the display, indicating that the filter cover or the top grille is not closed?
A: Check whether the filter cover or the top grille is tightly closed. If not, reinstall them. Power off the purifier, and wait at least 10 seconds before turning it on. Contact after-sales service if the above steps do not resolve the problem.
6.Q: What should I do if the display prompts "Motor Fault"?
A: Check whether the filter has been installed properly. If not, reinstall it. Check the fan for any foreign object blocking the motor or causing the motor to malfunction. If so, power off the air purifier and then power it back on after 10 seconds. Contact after-sales service if the above steps do not resolve the problem.
7.Q: What should I do if the PM2.5 concentrations displayed are abnormal or inaccurate?
A: In case of inaccurate or abnormal PM 2.5 concentrations, check whether the PM laser sensor compartment cover on the back of the air purifier is dirty or blocked. If it is dirty or blocked, open the PM laser sensor compartment cover using a blunt implement. Then, clean the filter and the sensor on the compartment cover by using a blower or hair dryer (do not use hot air). Wet a toothbrush with clean water and brush the filter mesh on the laser sensor cover gently. Reinstall the filter after cleaning and air-drying it. If the problem persists, please contact after-sales service. The value of environmental parameters displayed may vary between different purifiers. Differences in installation height and other environmental factors may also result in parameter variance. You may perform smoke test on sleep mode and perform it at different levels. If the margin of error increases linearly, the PM laser sensor is faulty. If the error is maintained within a certain range, the air purifier is operating properly.
8.Q: Why is there current noise when the purifier is powered down?
A: This noise is generated by inductors in its DC-DC circuit. The mainboard converts 24 V to 5 V or 3.3 V voltage, during which these inductors frequently switch on and off, since they are engaged in converting electric energy into a magnetic field and then back. During this conversion, a small current noise is generated during normal operation of the inductors.
9.Q: Why doesn’t the fan on the purifier’s PM laser sensor rotate?
A: When the display is on, the sensor shall operate continuously, displaying values in real time. When the display is off, the sensor only operates for 12-15 seconds every 2 minutes in order to prolong its working life. When you start the app, the sensor shall run continuously too. However, when you have quit the app, and the display is off for 5 minutes, the sensor will return to intermittent operation.
10.Q: What should I do if the purifier makes abnormal noises?
A: If the purifier makes abnormal noises while operating, check whether the filter is properly installed, and the filter package has been removed already. Then, check if there is any foreign object in the air purifier. If so, open the filter cover and remove the foreign object. Check whether there is any foreign object in the PM laser sensor.
11.Q: Can I position the air purifier horizontally?
A: This is not recommended. To produce the maximum air circulation allowing the clean air to reach every corner of your room to ensure optimal air purification performance, please position the air purifier vertically and keep the back of the purifier at least 10 cm away (the PM laser sensor is on the back of the device), the two sides and the front 20 cm away from any object (to prevent the air inlet from being blocked). If the air purifier is placed horizontally, the air circulation will be impeded, affecting its air purification performance.
12.Q: What are the precautions while connecting the air purifier to the network?
A: The Xiaomi Smart Air Purifier 4 Pro supports networked control and is compatible with most routers on the market.
However, note the following requirements concerning routers’ wireless networking:
1. The Xiaomi Smart Air Purifier 4 Pro can only be connected to 2.4 GHz Wi-Fi networks. It does not support 5 GHz Wi-Fi yet.
2. Wi-Fi encryption can only be WPA or WPA2. WEP encryption is not supported;
3. DHCP must be enabled on the router. Static IP address assignment, web certification, and enterprise-oriented IEEE 802.1X are not supported.
(To control the Xiaomi Smart Air Purifier 4 Pro via networking, download the "Mi Home / Xiaomi Home" app.)
13.Q: What should I do to control Xiaomi Smart Air Purifier 4 Pro remotely via phone?
A: Scan the QR code on the manual or search for the "Mi Home / Xiaomi Home" app on the app store. Download the app and bind the purifier to your Xiaomi account. Make sure your home Wi-Fi network is connected to the Internet. Connect your phone to the Wi-Fi network, start the purifier, and open the "Mi Home / Xiaomi Home" app. The app shall search for nearby Mi Home intelligent devices automatically, and prompt when a device is detected. Alternatively, tap + in the upper right corner to add a device manually. After adding Xiaomi Smart Air Purifier 4 Pro by following the prompts. You will be able to power it on or off, change mode, and check indoor air quality, temperature, and humidity via the app.
14.Q: Which settings will be lost after I reset the Wi-Fi?
A: The child lock and scheduled power-on/power-off defined by you in the app will be lost.
15.Q: Can one Xiaomi Smart Air Purifier 4 Pro be controlled by several people simultaneously?
A: Yes. ‘Share’ the device to specific Xiaomi accounts through the "Mi Home / Xiaomi Home" app to use this functionality.
16.Q: Can people with whom the Xiaomi Smart Air Purifier 4 Pro has been ‘shared’ upgrade the device firmware?
A: These ‘sharers’ cannot upgrade the firmware yet.
17.Q: The app is showing that the purifier is always offline, or has failed to connect to Wi-Fi. What is the solution?
A: 1. Check whether Xiaomi Smart Air Purifier 4 Pro is powered on and operating normally;
2. Ensure the Wi-Fi network is available.
3. Disconnect the power cord, and reconnect it after 10 seconds (long enough to allow the power supply to discharge). Then reset the purifier’s Wi-Fi settings, and reconnect it to the Wi-Fi network.
18.Q: What is Favorite mode?
A: This is a "Mi Home / Xiaomi Home" app setting that allows you to set the fan speed to suit your requirements. Set the fan speed to continuously variable for optimal air purification results.
19.Q: Will a humidifier affect the accuracy of the PM2.5 concentrations measured by the purifier?
A: Yes. An ultrasonic humidifier atomizes water into form of tiny, high-density particles. The air purifier’s highly sensitive sensor will detect these water particles. As a result, its measurements will be slightly higher than the actual values, possibly even reaching the sensor’s maximum reading. After shutting down the humidifier, the purifier’s readings will return to normal. This is normal.
20.Q: Why are the buttons not working?
A: The "Mi Home / Xiaomi Home" app includes a child lock for Xiaomi Smart Air Purifier 4 Pro. If it is enabled, the buttons on the purifier will fail to operate. You need to disable the child lock to use the buttons on the air purifier. Alternatively, you can turn the power off and on, or reset the Wi-Fi to disable the child lock.
21.Q: How do I turn the display on/off on Xiaomi Smart Air Purifier 4 Pro?
A: There is a brightness adjustment button on the back of the Xiaomi Smart Air Purifier 4 Pro. Press it once to switch the brightness between bright, dim, and off. If the purifier is connected to the "Mi Home / Xiaomi Home" app, its display brightness can also be adjusted in that app: Find the device in the app, and tap on it. Swipe down to "Display Brightness" and then tap on it.
22.Q: Which filter does Xiaomi Smart Air Purifier 4 Pro include as standard?
A: Xiaomi Smart Air Purifier 4 Pro includes an integrated high-quality filter, which is a combination of an antibacterial and antiviral filter and an activated carbon filter.
23.Q: What is the significance of the colors of the air quality indicator on the purifier's display? Why does the color suddenly change sometimes?
A: The air quality indicator of Xiaomi Smart Air Purifier 4 Pro provides an intuitive indication of PM 2.5 concentrations. The indicator color varies as the air quality changes. If the PM 2.5 concentration changes over a critical point, the indicator color changes accordingly.
24.Q: Why does the PM 2.5 concentration measured by several Xiaomi Smart Air Purifiers 4 Pro in the same environment differ? Why do their indicator colors differ?
A: In any room, dust moves along with airflow, and the volume of dust can even differ between corners of the same room. The high sensitivity of the Xiaomi Smart Air Purifier 4 Pro sensor makes it normal for purifiers to register different PM 2.5 concentrations. The difference in the PM 2.5 concentration readings between two Xiaomi Smart Air Purifiers 4 Pro can be calculated using the formula: (mean value - reading)/ mean value. An error of less than ± 10% is normal. Meanwhile, all electrical devices are produced with certain design tolerances. These imply differences in sensor voltages that can ultimately lead to differences in sensor output values. If the difference between two purifiers’ PM 2.5 readings is excessively large, the sensor compartment cover may be blocked with dust. Dismantle cover and clean away any dust. The color displayed by the purifier indicator depends on the PM 2.5 reading. If one purifier’s PM 2.5 reading is above a critical value, while another is below it, their indicators will display different colors.
25.Q: What is the difference between the Xiaomi Smart Air Purifier 4 Pro’s filter and those of other models? Can these filters be used interchangeably?
A: The Xiaomi Smart Air Purifier 4 Pro’s standard filters are capable of RFID. The purifier automatically calculates the filter life and provides timely filter replacement reminders.
Since the Xiaomi Smart Air Purifier 4 Pro’s filter is of different size to those of other models, the device cannot use the filter of other models interchangeably.
26.Q: How is the life of the Xiaomi Smart Air Purifier 4 Pro filter calculated, and how often should the filter be replaced?
A: The Xiaomi Smart Air Purifier 4 Pro automatically calculates the filter life based on weighted overall air quality in the operating environment, operating mode, and speed and duration of operation. If the purifier is operating in a space with good air quality, the filter life will last longer. Inversely, filter life will be shorter in spaces with poor air quality. Filter life is generally about 3–6 months. When the purifier records that the filter life remaining is no more than 10%, reminders will be provided via its display and via the app. One-tap purchase of filters is supported.
27.Q: What precautions should be observed in the use of a formaldehyde filter?
A: Replacement filters for the Xiaomi Smart Air Purifier 4 Pro are made of catalytic activated carbon. Activated carbon should absorb formaldehyde, methylbenzene, ammonia, TVOC, and the like. After using a filter for a period of time (about 1 month), take it out and air-dry it in sunlight for a while to neutralize the filter. For filters installed in purifiers operating in spaces with bad air quality, do this more frequently. Otherwise, secondary pollution may occur.
28.Q: What can I do if the formaldehyde filter loses efficacy?
A: Catalytic activated carbon absorbs formaldehyde efficiently and is widely used in purifiers on the market. These purifiers repeatedly filter the air, absorbing formaldehyde and thus purifying it. This method is scientific, environmentally-friendly, and will not generate substances harmful to humans. Formaldehyde is a slowly released (not one-off) gaseous pollutant. It can even take several years to be released completely. Formaldehyde is released more rapidly at room temperatures above 19°C, and the higher the temperature, the faster it is released. Complete release of formaldehyde takes time. Suppose the purifier is operating in a closed space, and that the formaldehyde concentration is 0.45 before operation begins and increases to 0.5 after a night. It is very likely that the space is contaminated with highly concentrated formaldehyde and the second reading would have been higher than 0.5 if the purifier had not been operating. In addition, you should use an eligible formaldehyde test device. At present, the Xiaomi Smart Air Purifier 4 Pro cannot deliver a filtration effect instantly.
If precise testing suggests that the efficacy of formaldehyde removal is low, it is very likely that the space contains sources that continue to release formaldehyde. You are advised to ventilate the room further.
29.Q: What should I do if the Xiaomi Smart Air Purifier 4 Pro smells bad?
A: It is not the purifier and filter that smell bad, but PM 2.5 and other pollutants in concentrated form, especially after long-term operation or usage in wet environments. To address this problem, regularly remove and air-dry the filter. This cannot, however, fully restore it to its unused state. This is normal.
30.Q: Do I need to reconfigure the filter life after replacing the Xiaomi Smart Air Purifier 4 Pro's expired filter?
A: The Xiaomi Smart Air Purifier 4 Pro includes an RFID tag module. Manual reconfiguration of the filter life is not necessary for the new filter.
31.Q: Why does the filter’s purification performance degrade?
A: Check whether the area of use is commensurate with the purifier’s specifications and mode of operation. The degree to which the room is sealed, and its height, may also affect filtration efficacy.
32.Q: Why is the PM 2.5 reading excessively high, or higher than the outdoors level?
A: Using humidifiers, smoking, cooking, and other behaviors can affect the purifier’s pollutant readings. Meanwhile, outdoor PM 2.5 levels determined via the app may sometimes differ from the actual values in some areas.
33.Q: Why do the PM 2.5 readings change when the Xiaomi Smart Air Purifier 4 Pro is operating without a filter installed?
A: Even without a filter installed, the PM 2.5 reading may increase or decrease, depending on the environment. Operating without a filter, the purifier works like a fan and ventilates the room. It mixes air with different PM 2.5 concentrations. The sensor will thus detect some random variation in PM 2.5 levels. After a long period of operation, the PM 2.5 concentration will even out, and the sensor reading will stabilize.
34.Q: Will a filter's life be reduced if it is not installed in the Xiaomi Smart Air Purifier 4 Pro?
A: No. The filter life is automatically calculated based on weighted overall air quality in the operating environment, operating mode, and duration of operation. It is written into the RFID tag, so the operation of the Xiaomi Smart Air Purifier 4 Pro will not reduce the life of a filter that is not installed on it.
35.Q: Will prolonged purifier operation reduce the room humidity?
A: Yes. The Xiaomi Smart Air Purifier 4 Pro filters particulate matters in the air, as well as water droplets, which in turn reduces the ambient humidity. This is normal. Water molecules are adsorbed onto the filter and activated carbon, causing the humidity to reduce. At the same time, this will affect the air purifier's performance, and lead to deviation in particulate matter readings.
36.Q: Can the air purifier remove odor of cooking fume and the like?
A: Yes. Depending on the operating environment, it may take a longer time to remove the odors. Meanwhile, the odor purification performance is affected by the amount of activated carbon in the filter and its service life used.
37.Q: Does Xiaomi Smart Air Purifier 4 Pro has the ionization function?
A: Yes. The ionization function is enabled by default. To enable or disable it, connect the air purifier to a network and use the "Mi Home / Xiaomi Home" app. With the function enabled, the ionization icon on the display is turned on. The purifier releases negative ions regularly; the negative ions combine with oxygen to form negative oxygen ions that help remove pollutants in the air. You may not realize the effect of this function under normal circumstances.
38.Q: Why does the air purifier prompt "Genuine Filter Only" after I replace the filter?
A: The Xiaomi Smart Air Purifier 4 Pro includes an RFID tag module. When the replacement filter is a new genuine filter with RFID, the purifier can accurately monitor the filter life, and manual reconfiguration of the filter life is not necessary. If this message persists after the installation of a new genuine filter, ensure that the filter is installed correctly. If not, install an original genuine filter and disconnect power for 10 seconds before powering on the purifier again. Contact after-sales service if the above steps do not resolve the problem.
39.Q: Can Xiaomi Smart Air Purifier 4 Pro be modified?
A: No. The Xiaomi Smart Air Purifier 4 Pro cannot be used with any third-party air purifier accessories available on the Internet that modify the device. This includes, for example, pipes to divert outdoor air to the purifier's filter or humidification devices installed on the unit's air outlet. Any modification may affect the performance, stability, and safety of the product. Therefore, any changes to the device’s original use are forbidden.
40.Q: Can the filter of Xiaomi Smart Air Purifier 4 Pro be used interchangeably with the previous models?
A: No. The Xiaomi Smart Air Purifier 4 Pro uses a unique filter incompatible with the previous models.
A: The purifier uses a low-noise, durable brushless DC motor that supports stepless speed control. The unit's maximum decibel level is ≤ 64 dB (A) and it can be switched to sleep mode when you are sleeping.
2.Q: What is the part on the upper back of the air purifier?
A: This is a particulate matter (PM) laser sensor. Its main function is to monitor PM2.5 concentration in the air.
3.Q: What should I do if the purifier cannot be powered on?
A: First, ensure the electricity outlet works properly, and the power cord is properly connected. If everything above is normal, when you turn the power on, you should hear a beep, and the Xiaomi logo should appear on the display and then disappear. Then, press the On/Off button to turn on the purifier. If you hear a beep and see a prompt displayed on the display, indicating that the cover or the top grille is not closed, the purifier is properly powered but the top grille or filter cover is not properly installed. Please reinstall the top grille or filter cover.
4.Q: The display is showing vertical lines, what has gone wrong?
A: Power down the purifier, then power it back on after at least 10 seconds. If the problem persists, the display is faulty. In this case, please contact after-sales service.
5.Q: What should I do if a prompt is shown on the display, indicating that the filter cover or the top grille is not closed?
A: Check whether the filter cover or the top grille is tightly closed. If not, reinstall them. Power off the purifier, and wait at least 10 seconds before turning it on. Contact after-sales service if the above steps do not resolve the problem.
6.Q: What should I do if the display prompts "Motor Fault"?
A: Check whether the filter has been installed properly. If not, reinstall it. Check the fan for any foreign object blocking the motor or causing the motor to malfunction. If so, power off the air purifier and then power it back on after 10 seconds. Contact after-sales service if the above steps do not resolve the problem.
7.Q: What should I do if the PM2.5 concentrations displayed are abnormal or inaccurate?
A: In case of inaccurate or abnormal PM 2.5 concentrations, check whether the PM laser sensor compartment cover on the back of the air purifier is dirty or blocked. If it is dirty or blocked, open the PM laser sensor compartment cover using a blunt implement. Then, clean the filter and the sensor on the compartment cover by using a blower or hair dryer (do not use hot air). Wet a toothbrush with clean water and brush the filter mesh on the laser sensor cover gently. Reinstall the filter after cleaning and air-drying it. If the problem persists, please contact after-sales service. The value of environmental parameters displayed may vary between different purifiers. Differences in installation height and other environmental factors may also result in parameter variance. You may perform smoke test on sleep mode and perform it at different levels. If the margin of error increases linearly, the PM laser sensor is faulty. If the error is maintained within a certain range, the air purifier is operating properly.
8.Q: Why is there current noise when the purifier is powered down?
A: This noise is generated by inductors in its DC-DC circuit. The mainboard converts 24 V to 5 V or 3.3 V voltage, during which these inductors frequently switch on and off, since they are engaged in converting electric energy into a magnetic field and then back. During this conversion, a small current noise is generated during normal operation of the inductors.
9.Q: Why doesn’t the fan on the purifier’s PM laser sensor rotate?
A: When the display is on, the sensor shall operate continuously, displaying values in real time. When the display is off, the sensor only operates for 12-15 seconds every 2 minutes in order to prolong its working life. When you start the app, the sensor shall run continuously too. However, when you have quit the app, and the display is off for 5 minutes, the sensor will return to intermittent operation.
10.Q: What should I do if the purifier makes abnormal noises?
A: If the purifier makes abnormal noises while operating, check whether the filter is properly installed, and the filter package has been removed already. Then, check if there is any foreign object in the air purifier. If so, open the filter cover and remove the foreign object. Check whether there is any foreign object in the PM laser sensor.
11.Q: Can I position the air purifier horizontally?
A: This is not recommended. To produce the maximum air circulation allowing the clean air to reach every corner of your room to ensure optimal air purification performance, please position the air purifier vertically and keep the back of the purifier at least 10 cm away (the PM laser sensor is on the back of the device), the two sides and the front 20 cm away from any object (to prevent the air inlet from being blocked). If the air purifier is placed horizontally, the air circulation will be impeded, affecting its air purification performance.
12.Q: What are the precautions while connecting the air purifier to the network?
A: The Xiaomi Smart Air Purifier 4 Pro supports networked control and is compatible with most routers on the market.
However, note the following requirements concerning routers’ wireless networking:
1. The Xiaomi Smart Air Purifier 4 Pro can only be connected to 2.4 GHz Wi-Fi networks. It does not support 5 GHz Wi-Fi yet.
2. Wi-Fi encryption can only be WPA or WPA2. WEP encryption is not supported;
3. DHCP must be enabled on the router. Static IP address assignment, web certification, and enterprise-oriented IEEE 802.1X are not supported.
(To control the Xiaomi Smart Air Purifier 4 Pro via networking, download the "Mi Home / Xiaomi Home" app.)
13.Q: What should I do to control Xiaomi Smart Air Purifier 4 Pro remotely via phone?
A: Scan the QR code on the manual or search for the "Mi Home / Xiaomi Home" app on the app store. Download the app and bind the purifier to your Xiaomi account. Make sure your home Wi-Fi network is connected to the Internet. Connect your phone to the Wi-Fi network, start the purifier, and open the "Mi Home / Xiaomi Home" app. The app shall search for nearby Mi Home intelligent devices automatically, and prompt when a device is detected. Alternatively, tap + in the upper right corner to add a device manually. After adding Xiaomi Smart Air Purifier 4 Pro by following the prompts. You will be able to power it on or off, change mode, and check indoor air quality, temperature, and humidity via the app.
14.Q: Which settings will be lost after I reset the Wi-Fi?
A: The child lock and scheduled power-on/power-off defined by you in the app will be lost.
15.Q: Can one Xiaomi Smart Air Purifier 4 Pro be controlled by several people simultaneously?
A: Yes. ‘Share’ the device to specific Xiaomi accounts through the "Mi Home / Xiaomi Home" app to use this functionality.
16.Q: Can people with whom the Xiaomi Smart Air Purifier 4 Pro has been ‘shared’ upgrade the device firmware?
A: These ‘sharers’ cannot upgrade the firmware yet.
17.Q: The app is showing that the purifier is always offline, or has failed to connect to Wi-Fi. What is the solution?
A: 1. Check whether Xiaomi Smart Air Purifier 4 Pro is powered on and operating normally;
2. Ensure the Wi-Fi network is available.
3. Disconnect the power cord, and reconnect it after 10 seconds (long enough to allow the power supply to discharge). Then reset the purifier’s Wi-Fi settings, and reconnect it to the Wi-Fi network.
18.Q: What is Favorite mode?
A: This is a "Mi Home / Xiaomi Home" app setting that allows you to set the fan speed to suit your requirements. Set the fan speed to continuously variable for optimal air purification results.
19.Q: Will a humidifier affect the accuracy of the PM2.5 concentrations measured by the purifier?
A: Yes. An ultrasonic humidifier atomizes water into form of tiny, high-density particles. The air purifier’s highly sensitive sensor will detect these water particles. As a result, its measurements will be slightly higher than the actual values, possibly even reaching the sensor’s maximum reading. After shutting down the humidifier, the purifier’s readings will return to normal. This is normal.
20.Q: Why are the buttons not working?
A: The "Mi Home / Xiaomi Home" app includes a child lock for Xiaomi Smart Air Purifier 4 Pro. If it is enabled, the buttons on the purifier will fail to operate. You need to disable the child lock to use the buttons on the air purifier. Alternatively, you can turn the power off and on, or reset the Wi-Fi to disable the child lock.
21.Q: How do I turn the display on/off on Xiaomi Smart Air Purifier 4 Pro?
A: There is a brightness adjustment button on the back of the Xiaomi Smart Air Purifier 4 Pro. Press it once to switch the brightness between bright, dim, and off. If the purifier is connected to the "Mi Home / Xiaomi Home" app, its display brightness can also be adjusted in that app: Find the device in the app, and tap on it. Swipe down to "Display Brightness" and then tap on it.
22.Q: Which filter does Xiaomi Smart Air Purifier 4 Pro include as standard?
A: Xiaomi Smart Air Purifier 4 Pro includes an integrated high-quality filter, which is a combination of an antibacterial and antiviral filter and an activated carbon filter.
23.Q: What is the significance of the colors of the air quality indicator on the purifier's display? Why does the color suddenly change sometimes?
A: The air quality indicator of Xiaomi Smart Air Purifier 4 Pro provides an intuitive indication of PM 2.5 concentrations. The indicator color varies as the air quality changes. If the PM 2.5 concentration changes over a critical point, the indicator color changes accordingly.
24.Q: Why does the PM 2.5 concentration measured by several Xiaomi Smart Air Purifiers 4 Pro in the same environment differ? Why do their indicator colors differ?
A: In any room, dust moves along with airflow, and the volume of dust can even differ between corners of the same room. The high sensitivity of the Xiaomi Smart Air Purifier 4 Pro sensor makes it normal for purifiers to register different PM 2.5 concentrations. The difference in the PM 2.5 concentration readings between two Xiaomi Smart Air Purifiers 4 Pro can be calculated using the formula: (mean value - reading)/ mean value. An error of less than ± 10% is normal. Meanwhile, all electrical devices are produced with certain design tolerances. These imply differences in sensor voltages that can ultimately lead to differences in sensor output values. If the difference between two purifiers’ PM 2.5 readings is excessively large, the sensor compartment cover may be blocked with dust. Dismantle cover and clean away any dust. The color displayed by the purifier indicator depends on the PM 2.5 reading. If one purifier’s PM 2.5 reading is above a critical value, while another is below it, their indicators will display different colors.
25.Q: What is the difference between the Xiaomi Smart Air Purifier 4 Pro’s filter and those of other models? Can these filters be used interchangeably?
A: The Xiaomi Smart Air Purifier 4 Pro’s standard filters are capable of RFID. The purifier automatically calculates the filter life and provides timely filter replacement reminders.
Since the Xiaomi Smart Air Purifier 4 Pro’s filter is of different size to those of other models, the device cannot use the filter of other models interchangeably.
26.Q: How is the life of the Xiaomi Smart Air Purifier 4 Pro filter calculated, and how often should the filter be replaced?
A: The Xiaomi Smart Air Purifier 4 Pro automatically calculates the filter life based on weighted overall air quality in the operating environment, operating mode, and speed and duration of operation. If the purifier is operating in a space with good air quality, the filter life will last longer. Inversely, filter life will be shorter in spaces with poor air quality. Filter life is generally about 3–6 months. When the purifier records that the filter life remaining is no more than 10%, reminders will be provided via its display and via the app. One-tap purchase of filters is supported.
27.Q: What precautions should be observed in the use of a formaldehyde filter?
A: Replacement filters for the Xiaomi Smart Air Purifier 4 Pro are made of catalytic activated carbon. Activated carbon should absorb formaldehyde, methylbenzene, ammonia, TVOC, and the like. After using a filter for a period of time (about 1 month), take it out and air-dry it in sunlight for a while to neutralize the filter. For filters installed in purifiers operating in spaces with bad air quality, do this more frequently. Otherwise, secondary pollution may occur.
28.Q: What can I do if the formaldehyde filter loses efficacy?
A: Catalytic activated carbon absorbs formaldehyde efficiently and is widely used in purifiers on the market. These purifiers repeatedly filter the air, absorbing formaldehyde and thus purifying it. This method is scientific, environmentally-friendly, and will not generate substances harmful to humans. Formaldehyde is a slowly released (not one-off) gaseous pollutant. It can even take several years to be released completely. Formaldehyde is released more rapidly at room temperatures above 19°C, and the higher the temperature, the faster it is released. Complete release of formaldehyde takes time. Suppose the purifier is operating in a closed space, and that the formaldehyde concentration is 0.45 before operation begins and increases to 0.5 after a night. It is very likely that the space is contaminated with highly concentrated formaldehyde and the second reading would have been higher than 0.5 if the purifier had not been operating. In addition, you should use an eligible formaldehyde test device. At present, the Xiaomi Smart Air Purifier 4 Pro cannot deliver a filtration effect instantly.
If precise testing suggests that the efficacy of formaldehyde removal is low, it is very likely that the space contains sources that continue to release formaldehyde. You are advised to ventilate the room further.
29.Q: What should I do if the Xiaomi Smart Air Purifier 4 Pro smells bad?
A: It is not the purifier and filter that smell bad, but PM 2.5 and other pollutants in concentrated form, especially after long-term operation or usage in wet environments. To address this problem, regularly remove and air-dry the filter. This cannot, however, fully restore it to its unused state. This is normal.
30.Q: Do I need to reconfigure the filter life after replacing the Xiaomi Smart Air Purifier 4 Pro's expired filter?
A: The Xiaomi Smart Air Purifier 4 Pro includes an RFID tag module. Manual reconfiguration of the filter life is not necessary for the new filter.
31.Q: Why does the filter’s purification performance degrade?
A: Check whether the area of use is commensurate with the purifier’s specifications and mode of operation. The degree to which the room is sealed, and its height, may also affect filtration efficacy.
32.Q: Why is the PM 2.5 reading excessively high, or higher than the outdoors level?
A: Using humidifiers, smoking, cooking, and other behaviors can affect the purifier’s pollutant readings. Meanwhile, outdoor PM 2.5 levels determined via the app may sometimes differ from the actual values in some areas.
33.Q: Why do the PM 2.5 readings change when the Xiaomi Smart Air Purifier 4 Pro is operating without a filter installed?
A: Even without a filter installed, the PM 2.5 reading may increase or decrease, depending on the environment. Operating without a filter, the purifier works like a fan and ventilates the room. It mixes air with different PM 2.5 concentrations. The sensor will thus detect some random variation in PM 2.5 levels. After a long period of operation, the PM 2.5 concentration will even out, and the sensor reading will stabilize.
34.Q: Will a filter's life be reduced if it is not installed in the Xiaomi Smart Air Purifier 4 Pro?
A: No. The filter life is automatically calculated based on weighted overall air quality in the operating environment, operating mode, and duration of operation. It is written into the RFID tag, so the operation of the Xiaomi Smart Air Purifier 4 Pro will not reduce the life of a filter that is not installed on it.
35.Q: Will prolonged purifier operation reduce the room humidity?
A: Yes. The Xiaomi Smart Air Purifier 4 Pro filters particulate matters in the air, as well as water droplets, which in turn reduces the ambient humidity. This is normal. Water molecules are adsorbed onto the filter and activated carbon, causing the humidity to reduce. At the same time, this will affect the air purifier's performance, and lead to deviation in particulate matter readings.
36.Q: Can the air purifier remove odor of cooking fume and the like?
A: Yes. Depending on the operating environment, it may take a longer time to remove the odors. Meanwhile, the odor purification performance is affected by the amount of activated carbon in the filter and its service life used.
37.Q: Does Xiaomi Smart Air Purifier 4 Pro has the ionization function?
A: Yes. The ionization function is enabled by default. To enable or disable it, connect the air purifier to a network and use the "Mi Home / Xiaomi Home" app. With the function enabled, the ionization icon on the display is turned on. The purifier releases negative ions regularly; the negative ions combine with oxygen to form negative oxygen ions that help remove pollutants in the air. You may not realize the effect of this function under normal circumstances.
38.Q: Why does the air purifier prompt "Genuine Filter Only" after I replace the filter?
A: The Xiaomi Smart Air Purifier 4 Pro includes an RFID tag module. When the replacement filter is a new genuine filter with RFID, the purifier can accurately monitor the filter life, and manual reconfiguration of the filter life is not necessary. If this message persists after the installation of a new genuine filter, ensure that the filter is installed correctly. If not, install an original genuine filter and disconnect power for 10 seconds before powering on the purifier again. Contact after-sales service if the above steps do not resolve the problem.
39.Q: Can Xiaomi Smart Air Purifier 4 Pro be modified?
A: No. The Xiaomi Smart Air Purifier 4 Pro cannot be used with any third-party air purifier accessories available on the Internet that modify the device. This includes, for example, pipes to divert outdoor air to the purifier's filter or humidification devices installed on the unit's air outlet. Any modification may affect the performance, stability, and safety of the product. Therefore, any changes to the device’s original use are forbidden.
40.Q: Can the filter of Xiaomi Smart Air Purifier 4 Pro be used interchangeably with the previous models?
A: No. The Xiaomi Smart Air Purifier 4 Pro uses a unique filter incompatible with the previous models.
Does it help?
Yes
No