How to reset the filter counter on Xiaomi Mi Air Purifier 2: full instructions with nuances

Xiaomi Mi Air Purifier 2 is one of the most popular devices for maintaining a healthy microclimate in the house. However, over time, its filters get clogged and the built-in meter begins to remind you to replace. What if you just installed a new filter and the device persistently signals its wear? Or how to reset the timer after self-cleaning? In this article, we will discuss all the ways of resetting the filter, from standard to hidden functions that are not mentioned in the official instructions.

Complicating the problem is that the Mi Air Purifier 2 interface is not always intuitive, and the Mi Home mobile app can vary depending on the firmware version. We tested all the current methods on devices with different regional firmware (CN, EU, RU) and collected checklists to help avoid typical errors.

If you've tried to reset the meter, but the device still shows an error, don't rush to buy a new filter. 80 percent of the time, the problem is solved software-based, without physical intervention. And for those who prefer visual instructions, at the end of this article, we've given a comparative table of reset methods for different versions of the Mi Air Purifier.

Why you should reset the filter counter and when to do it

The Xiaomi Mi Air Purifier 2 uses a filter resource tracking system based on operating time and air volume. When the meter reaches a critical value (usually a 3600 watch for a HEPA- filter or a 1800 watch for coal), the device begins to signal wear:

• 🔴 The indicator on the body flashes red or orange.
• 📱 The Mi Home app appears with a notice "Filter life expired."
• 🔊 When turned on, an audible signal is emitted (in some firmware).
• 🌀 The device automatically goes into reduced power mode.

Resetting the counter is required in three cases:

1. After changing the filter, the device correctly tracks the resource of the new cartridge.
2. After deep cleaning – if you have washed or blown the filter (for example, coal), but its physical condition allows further operation.
3. When the software fails - when the counter is reset spontaneously or shows incorrect values.

Ignoring the filter replacement signals can cause not only the air purification to deteriorate, but also the engine to overload, which can lead to failure, but resetting too often without actually changing the filter is also harmful: a contaminated cartridge loses its effectiveness, and the device’s sensors begin to give false readings.

Method 1: Reset via Mi Home (official method)

The easiest and recommended way for the manufacturer is to use a proprietary application, but there are nuances associated with the device's firmware version and regional settings.

1. Open the Mi Home app and select your air purifier from the device list.
2. Go to the Settings section (cog in the upper right corner).
3. Find Filter Life (or Filter Life in the Russified version).
4. Slip the Reset button (or Reset).
5. Confirm the action in the dialog window.

If the Reset button is inactive or absent, the reasons may be as follows:

• 🔄 The device is not synced to Xiaomi servers (check Wi-Fi connection).
• 📱 An outdated version of the app (update Mi Home to the App Store or Google Play).
• 🌍 Regional restrictions (e.g., Chinese firmware may block reset for European users).

Update the application to the latest version

Make sure the cleaner is connected to Wi-Fi

Check that the device is online in Mi Home

Close background applications that may interfere with synchronization-->

In some cases, after the reset, the meter can show 100%, but after a few hours, it can fall back to 0%, because the device recalculates the filter life based on the stored air pollution data, to avoid this, after the reset:

1. Turn off the cleaner for 10 minutes.
2. Turn it on again and wait for full synchronization with the application.

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If the application displays a Failed to Reset error after reset, try reconnecting the device to Mi Home: remove it from the list and add it again via Add Device.

Method 2: Manual reset through buttons on the body

If the Mi Home app is not available (for example, there is no Internet or the device is unconnected from the account), you can reset the filter counter from the control panel. This method works on all versions of the Mi Air Purifier 2, but requires strict adherence to the sequence:

1. Make sure the device is on and on standby (the indicator is green or blue).
2. Press the Power button for 5 seconds until you hear the beep.
3. Without releasing Power, press the Mode button once.
4. Release both buttons - the indicator should flash 3 times yellow, signaling a successful reset.

If the indicator flashes red, it means that:

• 🔋 The device did not recognize the command (try again).
• 🔄 The software has crashed (reboot required).
• 🛠️ The filter is physically missing or incorrectly installed.

On some firmware (e.g. CN 4.6.1_1234), this combination may not work.

1. Turn off the cleaner with the Power button.


2. Press the Mode button and hold it.




3. Enable the device with the Power button without letting the Mode go.




Hold both buttons for 10 seconds until the indicator starts flashing yellow.

Method 3: Reset via the Engineering Menu (for advanced users)

If standard methods don’t work, you can use the hidden engineering menu that is available on most Xiaomi devices, which requires caution, as improper actions can lead to firmware failure.

Instructions for entering the engineering menu:

1. Turn off the air purifier with the Power button.
2. Press the Mode button and, holding it, turn on the device with the Power button.
3. Hold the Mode for another 10 seconds until the indicator flashes white.
4. Release the button and the device will go into diagnostic mode.

In the engineering menu, the filter setting is designated as FILT or FLTR. To reset the counter:

1. Press Mode briefly to switch between options until you find FILT.
2. Press the Mode for 3 seconds to reset the value.
3. Confirm exit from the menu by holding the Power for 5 seconds.

Please note: the engineering menu also includes:

• 📊 View engine running time (MOTR).
• 🌡️ Check current sensor readings (SENS).
• 🔄 Calibrate the sensor PM2.5 (CALI).

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The engineering menu allows you not only to reset the filter, but also to diagnose malfunctions, for example, if the ERR 2 flashes red, this indicates a problem with the air quality sensor.

After leaving the engineering menu, the device will automatically restart. If the indicator continues to burn red, try:

1. Remove the plug from the socket for 1 minute.
2. Go back to the engineering menu and reset.

Table: Comparison of reset methods for different versions of Mi Air Purifier 2

If your firmware version is not listed in the table, check it through the Mi Home app in the About Device section, for example, the 4.6.1_1234 firmware is Chinese and the 2.1.8_9999 is European.

Frequent Mistakes and How to Avoid Them

Even if you follow instructions correctly, users often encounter problems, and here are the most common mistakes and ways to solve them:

⚠️ Warning: If the filter counter shows 0% after reset and does not increase, it means that the device does not recognize the new filter. Check if it is installed correctly (there should be a click when fixing).

• 🔌 The device doesn't respond to the buttons -- maybe the power supply is faulty. Try another cable or outlet.
• 📶 Unable to connect to Mi Home – reset your Wi-Fi settings on the cleaner (hold Mode + Power for 15 seconds).
• ⏳ The meter is reset spontaneously – update the firmware through Mi Home (Section Update).

One of the most insidious errors is that the filter sensor is falsely triggered, and this happens when the device has been operating in a high-pollution environment for a long time (e.g. during repairs), in which case the meter can show 0% even on a new filter.

1. Reset the counter with any of the methods described.
2. Turn on the cleaner at maximum power for 1 hour.
3. Turn off and turn on the device again - the meter must be updated.

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If you use non-original filters, the meter may be reset more often, so after each filter cleaning, reset through the engineering menu, not through the Mi Home (this will reduce the risk of blocking).

What to do if none of the methods work

If all methods are exhausted and the filter counter is still not reset, the problem may be related to:

• 🛠️ Hardware failure (damaged filter sensor or control board).
• 🖥️ Firmware failure (requires flashing through Mi Home or service center).
• 🔒 Blocking your Xiaomi account (if your device is tied to another region).

In such cases, try a full reset to factory settings:

1. Disconnect the cleaner from the network.
2. Press both buttons (Power + Mode) and, holding them, connect the device to the power.
3. Hold the buttons for 15 seconds until the indicator flashes red and green.
4. Release the buttons - the device will reset and restart.

⚠️ Warning: Full reset removes all settings, including binding to Mi Home. After the procedure, you will need to reconnect the cleaner to the application and configure Wi-Fi.

If that doesn’t work, there are two options:

1. Update the firmware manually through Mi Home (in the Software Update section, click Update Check).
2. Contact the Xiaomi service center (if the device is warranty).

Important: Some firmware (e.g., CN 3.5.8_0000) may need to be activated again via the Aqara Home app after a complete reset instead of Mi Home.

FAQ: Answers to Frequent Questions