Your Philips Air Purifier or Humidifier needs to be reset after each filter replacement. This is done to activate the counting system for the new filter(s).

Also, your air purifier/humidifier is equipped with a filter replacement alert. It warns you when the filter needs to be cleaned (pre-filter only) and replaced.

If you do not reset the air purifier or humidifier after replacing a new filter, the appliance will alert you to replace a filter.

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

Meanings of codes in Philips Air PurifiersDepending on the Air Purifier model you have, you might find 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 œEr still persists, we recommend you to contact us.

Error code: E1 to E4

The appliance has malfunctions. In this case, we recommend you to contact us.

The information on this page applies to the following models: AC2959/63, AC1758/63, AC3059/65.