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    What do the codes on my Philips Air Purifier mean?

    Your Philips Air Purifier gives you reassurance by displaying indoor air quality codes in real time. Discover what the codes mean.

    Meanings of codes in Philips Air Purifiers

    Depending on the Air Purifier model you have, you might see one or more of the following indicators or codes:

    • Code: A
      Auto mode

    • Code: C
      Gas mode (AC3254 and AC3256 only)

    • Code: L
      Child lock on

    • Code: UL
      Child lock off

    • Code: F0
      Clean the pre-filter

    • Code: A0 to A9
      Replace NanoProtect S3 HEPA filter

    • Code C0 to C9:
      Replace NanoProtect S3 AC filter

    • Code SL
      Sleep Mode

    • Code 1h:
      Timer mode

    • Code t:
      Turbo Mode.

    • Error Code: Er
      The hall sensor is not working properly. Remove and then reattach the front panel If the error code "Er" still persists, we recommend that you contact us.

    • Error code: E1 to E4
      The appliance has malfunctioned. In this case, we recommend that you contact us.

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