Air Quality Sensor - Philips AC4075 User Manual

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2 To remove the pre-filter, grab the two projections and pull the filter
towards you.
3 Wash the pre-filter under a running tap. If the pre-filter is very dirty,
use a soft brush to brush away the dust.
Tip: Alternatively, you can clean the pre-filter by removing the dust with a
vacuum cleaner.
4 Air-dry the pre-filter.
Note: Make sure that the pre-filter is completely dry. If it is still wet, bacteria
may multiply in it and shorten the lifetime of the pre-filter.
5 Put the pre-filter back into the appliance. Attach all hooks properly
to the appliance.
Note: Make sure that the side with the two projections is pointing towards you.
6 To reattach the front panel, insert the bottom hooks into the bottom
of the appliance first (1). Then push the panel against the body of the
appliance (2).

Air quality sensor

Clean the air quality sensor every 2 months for optimal functioning of
the appliance. Clean it more frequently if you use the appliance in a dusty
environment.
Note: When the humidity level in the room is very high, it is possible that
condensation develops on the air quality sensor. As a result, the AIR QUALITY
light on the control panel and the air quality light ring may indicate that the air
quality is bad even though the air quality is good. In this case you have to clean
the air quality sensor or use one of the manual speed settings.
1 Clean the air quality sensor inlet and the air quality sensor
outlet with a soft brush.
2 Remove the air quality sensor cover.