Filter Replacement; Filter Maintenance - Philips AC4072 Mode D'emploi

3 Clean the air quality sensor, the dust inlet and the dust outlet with a
lightly moistened cotton swab.
4 Dry them with a dry cotton swab.
5 Reattach the air quality sensor cover.

Filter replacement

Filter maintenance

This appliance is equipped with the Healthy air protect lock to ensure that
the filters are in optimal condition when the appliance is operating.
When one of the filters is almost full and has to be cleaned or replaced,
the appropriate filter replacement light starts to flash. When you do
not replace the multi-layer filter, the appliance stops operating and the
appliance is locked.
When the appliance is locked, the filter replacement light of the filter
concerned lights up on continuously.
Note: Only replace a filter when the filter replacement light flashes. If you
replace the filter before the filter replacement light starts flashing, the lifetime
counter will not be reset but will continue counting the lifetime of the previous
filter. As a result, the filter replacement light will start flashing much too soon.
Filter replacement lights
The filter replacement lights indicate which filter has to be cleaned or
replaced.
- Filter replacement light 1 flashes: filter 1 (the pre-filter) has to be
cleaned. See chapter 'Cleaning' for further instructions.
- Filter replacement light 2 flashes: the multi-layer filter has to be
replaced.
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