Owners of smart air purifiers often encounter an intrusive indicator that signals the need to replace consumables. Xiaomi’s smart home system is designed so that after installing a new cartridge, the device does not always automatically understand this action, resulting in a red indicator on the panel, and the application continues to hang a notification of zero resource, although the physical filter has already been replaced.
Ignoring this signal can lead to malfunctioning of the purification algorithms, as HEPA-The expired filter creates high aerodynamic drag, which causes the fan to run at higher revs, increasing noise levels and power consumption. Timely reset of the meter is a critical procedure to maintain the declared efficiency of Xiaomi Air Purifier.
In this guide, we will take a look at all the ways to activate a new filtering resource, from mechanical buttons on the case to fine-tuning through a mobile application, and learn why sometimes standard methods do not work, and how to force the device controller to restart if it is “hang” in the waiting mode of replacement.
Mechanical reset through a button on the body
The most common and quick way to reset the resource meter is to use a physical control button. On most models, such as the Xiaomi Mi Air Purifier 2S, 3, 3H or 4 Pro, this button is located on the front panel or on the end of the device, and it also serves to turn the device on and switch the fan modes.
To perform the procedure, you need to hold the button in a clamped state for a certain time. This usually takes 6 to 10 seconds. At this point, an LED indicator that is lit in red or orange should flash or emit a characteristic audible signal. It is important not to release the button immediately after the first blink - wait until the indicator lights up in green or white, which will confirm the successful acceptance of the command by the controller.
⚠️ Warning: If nothing happens after a long hold of the button (more than 15 seconds), it is possible that the device is locked or in diagnostic mode. Try first to completely disconnect the power cleaner by pulling the plug out of the socket, wait 30 seconds and turn on again.
Sometimes the mechanical button may be contaminated with dust, which prevents normal contact. In such cases, it is recommended to gently wipe the area around the button with a dry soft cloth before retrying. If the device is equipped with a touch panel, the touch should be sure, but not excessively strong, so as not to damage the capacitive layer of control.
☑️ Pre-reset check
Management through the Mi Home app
The digital twins of devices in the Mi Home ecosystem allow you to control cleaners remotely and monitor the state of consumables in real time. If the mechanical button does not respond or the device is installed in a hard-to-reach place, you can reset via your smartphone. To do this, make sure that the phone is connected to the same Wi-Fi network as the cleaner, or has an active mobile Internet connection if remote access is configured.
Go to your device card in the app. The control interface usually displays the current percentage of the filter resource. By clicking on the filter icon or going to the optional settings menu (often indicated by three dots or a gear), you will find the item "Reset the filter" or "Filter Reset." After clicking, the system will request confirmation of action, since this is a critical operation for cleaning algorithms.
In some versions of the firmware, the interface may differ. For example, in the new Xiaomi Air Purifier 4 Lite models, the reset menu is hidden in the Device Settings → Service section. If you don’t see this option, check for updates for the device plugin itself in the app store or in the Mi Home profile settings.
It's worth noting that the Mi Home app also allows you to set up automatic notifications, so you can set a threshold at which the phone will remind you of a replacement, for example, with 10% of the remaining resource, which helps you plan to buy new cartridges in advance, without waiting for the ventilation system to shut down completely.
Problems with the definition of a new filter
There are times when you've replaced the cartridge, you've reset, but after a short time, the indicator lights up again in red, which indicates that air quality sensors or flowmeters are detecting anomalies. Often the problem lies in the forgotten protective film. HEPA-filters are tightly packed in polyethylene to preserve properties (activated carbon) during storage.
If the film is not removed, the airflow is blocked, the pressure sensor inside the housing registers critical resistance and forcibly switches on the replacement mode, and the reason may be the inconsistency of the cartridge in the seat, the compartment cover should close with a characteristic click or fit tightly, ensuring the tightness of the contour.
| Model of the device | Type of discharge | Retention time | Indication of success |
|---|---|---|---|
| Mi Air Purifier 2S | Light button/mode | 6 seconds | Sound signal |
| Mi Air Purifier 3H | Touch button | 6 seconds | Blinking the ring |
| Mi Air Purifier 4 Pro | Activation button | 10 seconds. | Green indicator |
| Mi Air Purifier Lite | Mi Home appendix | N/D | Update of % in the annex |
Another reason for false positives may be the use of unoriginal or incorrect filter analogues. The identification chip built into the original Xiaomi cartridges transmits type and residual resource data. Cheap copies may not have this chip or have incorrect calibration, which makes the smart cleaner unable to read data and goes into emergency mode.
Can I use filters from other brands?
Use of third-party utilities and integrations
For advanced users who have integrated their devices into smart home systems like Home Assistant or HomeBridge, more flexible management methods are available. Through Xiaomi MiOT integration, you can create automations that will reset the meter on a schedule or when certain conditions are met, although this is rarely required in the home.
In Home Assistant, the essence of a cleaner is often represented by multiple sensors, one of which is responsible for the state of the filter. You can create a script that will send a reset command, which is especially convenient if you have multiple cleaners in different rooms and you want to centrally manage their maintenance.
However, using third-party scripts carries risks. Incorrectly composed commands can lead to desynchronization of data between the Xiaomi cloud and the local device. Local communication protocol may differ from the cloud API, so it is recommended to back up the configuration of your smart home before implementing such solutions.
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If you use Home Assistant, add the device via Xiaomi Miio integration (via IP and Token), not just through the cloud, allowing you to control the cleaner even when there is no internet and reduce delays when executing reset commands.
Diagnostics of errors and indicators
Understanding the color indication helps to quickly diagnose the problem: If the indicator burns orange after reset, this means that the filter life is coming to an end (usually less than 20%), but the device is still working normally.
A flashing red light often indicates installation error or critical contamination of the particulate matter (PM2.5) sensor. In this case, simply resetting the meter will not help - it requires physical cleaning of the sensor. It is located on the side of the case and closed with a small grille. Gently blow this compartment with compressed air or use a soft brush.
⚠️ Warning: Never use wet fabric or chemical solutions to clean the internal air quality sensor «F1» or «F2» display.
If foreign objects (buttons, toys, or large dust) get into the fan, the device can block the engine and signal an error that users often confuse with requiring a filter to be replaced.