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Problem Possible solution
The appliance doesn’t
work.
You ignored the lter replacement lights. You did not replace a lter when
the corresponding lter replacement light and the REPLACE FILTER light
started ashing and did not respond when the appliance started to beep
every 30 minutes after approx. 2 weeks. As a result, the appliance is now
locked and you have to replace the lter and reset the appliance (see
chapter ‘Filter replacement’) so that the appliance can provide healthy air
again.
The AIR QUALITY lights
keep ashing and the
appliance does not work.
There is a problem with the air quality sensor of the appliance. Please
contact the Philips Consumer Care Centre in your country (you nd its
phone number in the worldwide guarantee leaet). If there is no Consumer
Care Centre in your country, go to your local Philips dealer.
No air comes out of the
air outlet
The appliance is not switched on. Put the plug in the wall socket and switch
on the appliance.
The air quality is good and the auto mode is activated. In this case, the
appliance stops operating automatically when the air is clean to save
electricity.
The airow that comes
out of the air outlet is
signicantly weaker than
before.
The pre-lter is dirty. Clean the pre-lter (see chapter ‘Cleaning’).
You haven’t removed all packaging material from the lters. Make sure that
you have removed all packaging material.
The air quality does not
improve, even though
the appliance has been
operating for a long time.
One of the lters has not been placed in the appliance. Make sure that
all lters are properly installed in the following order, starting with the
innermost lter: HEPA lter, activated carbon lter, multi-care lter (AC4004
only), pre-lter. The multi-care lter (AC4004 only) has to be attached to
the back of the pre-lter.
The air quality sensor is wet. The humidity level in your room is high and
causes condensation. Make sure that the air quality sensor is clean and dry
(see chapter ‘Cleaning’).
The room in which you run the appliance is larger than 30m², which is the
maximum size at which this air purier can operate effectively.
The AIR QUALITY
light does not change
colour even though
the appliance has been
operating for some time.
The air quality sensor is dirty. Clean the air quality sensor (see
chapter ‘Cleaning’).
I need cleaner air because
I have an allergy.
You can change the air quality sensor sensitivity (see chapter ‘Using the
appliance’) to make the air purier clean the air even better.
The appliance is extra
loud.
You have not removed all packaging material from the lters. Make sure that
you have removed all packaging material.
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