If you notice an exclamation mark icon on the air purifier's control panel, it indicates that the filter cannot be detected. This is usually related to the filter's RFID (Radio Frequency Identification) system.
¶ 1. Detection Principle (RFID)
The air purifier utilizes RFID technology to achieve filter level identification, lifespan tracking, and other data synchronization.
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Electronic Tag (Tag): A tiny RFID tag is embedded on the side of each filter layer. It contains the unique ID and type information for that specific filter.
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Reader Antenna (Reader): Five rectangular induction areas (antennas) are arranged on the main circuit board located on the right side inside the purifier.
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Interaction Method: When the filter is correctly pushed into the guide rail and fully seated, the tag on the filter will align precisely with the induction antenna on the circuit board. The board then wirelessly reads the tag's information via radio frequency signals to confirm filter installation.
¶ 2. Common Troubleshooting Steps
If the exclamation mark appears on the display, please follow these steps in order:
¶ Step 1: Check Installation Depth (Most Common Cause)
- Ensure fully seated: Firmly push the filter inward towards the right side to ensure it is completely inserted into the rail. If the filter is not fully in place, the physical distance between the tag and the antenna may be too large, leading to detection failure.
- Check Orientation:
- Ensure the filter is not installed backwards. The side containing the RFID tag must face the right side of the machine (the side where the circuit board is located).
- Check the position of the RFID tag: It is recommended to line up all filters side-by-side to observe if the RFID tags on the side are neatly aligned. This helps determine if a tag's position is offset, missing, or damaged.
¶ Step 2: Physical Obstruction and Foreign Objects
- Clear shielding materials: Check the filter tag surface or the circuit board's induction area for metallic substances, thick dust, or tape. RFID signals can be blocked by metal or specific dense materials.
- Clean the guide rails: Check if any debris in the rails is obstructing the filter's movement or preventing the side from sitting flush against the inner wall of the machine.
¶ Step 3: Check Circuit Board Connection
- Inspect cables: If filters across all levels are undetected, the communication ribbon cable at the top of the main circuit board might be loose or poorly connected.
- Note: This operation may require opening the side panel; it is recommended to perform this under professional guidance.
Since the exclamation mark alert is primarily used to identify the filter ID for lifespan synchronization, it does not affect the air purifier's core filtration functions or normal airflow regulation. In this scenario, you may choose to ignore the prompt and continue normal operation.
¶ 3. Maintenance and Prevention Tips
- Keep it dry: The filter compartment should remain dry. Moisture may lead to tag damage or reduced induction performance of the circuit board.
- Use original filters: Non-original filters may lack RFID tags or have mismatched tag encoding, resulting in recognition failure.
- Lifespan Reset: RFID tags record unique identifiers.