Philips AC4004 User Manual page 23

Problem
The appliance still
indicates that I need
to replace a filter, but I
already did.
When I press the SLEEP
button, all lights except
for the SLEEP light go out.
The appliance stops
operating, although the
power-on light is still on.
The appliance does not
work. The air quality light
ring flashes blue, all other
lights are out.
Possible solution
Perhaps you did not reset the appliance. Plug in the appliance, press and
hold the reset button corresponding to the filter you have replaced. The
appliance beeps if you have reset it properly.
When you press the SLEEP button, the appliance enters the SLEEP mode,
which is designed to allow you to sleep undisturbed. The appliance operates
quietly and only the SLEEP light is on. If you have activated the timer, one
of the HOUR lights is also on. All lights that are on in the SLEEP mode are
dimmed to allow you to sleep undisturbed.
The built in quality sensor has determined that the air quality is good and
that the air does not need to be cleaned anymore. When the air quality
deteriorates, the appliance is starts running at a low fan speed and noise
level so that the energy consumption is minimised.
This is air particle sensor error or an air particle sensor and gas sensor
error. Contact the Consumer Care Centre in your country (you find its
phone number in the worldwide guarantee leaflet). If there is no Consumer
Care Centre in your country, go to your local Philips dealer.
English
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