Philips AC4374 - Troubleshooting

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8 Troubleshooting
This chapter summarizes the most common problems you could encounter with the
purier. If you are unable to solve the problem with the information below, contact the
Consumer Care Center in your country.
Problem Possible solution
The , , ,
indicators has been
on continuously.
The lter is full. Replace the lter and reset the purier.
No air comes out of
the air outlet.
The purier is not connected to the power supply. Plug the
purier into the power supply and switch on.
The fan speed does
not change when
the mode is
activated.
In mode, the fan speed is set to a very low level. If you
want to change the fan speed, press the button one or
more times to set the desired fan speed.
The airow that
comes out of the air
outlet is signicantly
weaker than before.
• The pre-lter is dirty. Clean the pre-lter (see ‘Clean the
pre-lter’).
• You have not 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 purier
has been operating
for a long time.
• One of the lters has not been placed in the purier.
Make sure that all lters are properly installed in the
following order, starting with the innermost lter: For
AC4372: HEPA lter (4), activated carbon lter (3), multi-
care lter (2) and pre-lter (1). For AC4374: Integrated
Multi-care lter (2), pre-lter (1).
• 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 ‘Clean the air
quality sensor’).
The color of the air
quality light always
stays the same.
• The air quality sensor is dirty. Clean the air quality sensor
(see ‘Clean the air quality sensor’).
I need cleaner air
because I have an
allergy.
You can change the air quality sensor sensitivity (see 'Set
the sensitivity of the air quality sensor’) to make the purier
clean the air even better.