Philips AC4004 User Manual page 16

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8 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.
9 To reattach the front panel, insert the two hooks into the top of
the appliance first (1). Then push the panel against the body of the
appliance (2).
10 Put the plug in the wall socket.
11 Press and hold the reset button for filter 1 (the button below the
filter cleaning light) for 2 seconds to reset the appliance.
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 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.