Troubleshooting - Philips AC4374 User Manual

8 Troubleshooting

This chapter summarizes the most common problems you could encounter with the
purifier. If you are unable to solve the problem with the information below, contact the
Consumer Care Center in your country.
Problem
The , , ,
indicators has been
on continuously.
No air comes out of
the air outlet.
The fan speed does
not change when
the mode is
activated.
The airflow that
comes out of the air
outlet is significantly
weaker than before.
The air quality does
not improve, even
though the purifier
has been operating
for a long time.
The color of the air
quality light always
stays the same.
I need cleaner air
because I have an
allergy.
Possible solution
The filter is full. Replace the filter and reset the purifier.
The purifier is not connected to the power supply. Plug the
purifier into the power supply and switch on.
In mode, the fan speed is set to a very low level. If you
want to change the fan speed, press the
more times to set the desired fan speed.
• The pre-filter is dirty. Clean the pre-filter (see 'Clean the
pre-filter').
• You have not removed all packaging material from the
filters. Make sure that you have removed all packaging
material.
• One of the filters has not been placed in the purifier.
Make sure that all filters are properly installed in the
following order, starting with the innermost filter: For
AC4372: HEPA filter (4), activated carbon filter (3), multi-
care filter (2) and pre-filter (1). For AC4374: Integrated
Multi-care filter (2), pre-filter (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 air quality sensor is dirty. Clean the air quality sensor
(see 'Clean the air quality sensor').
You can change the air quality sensor sensitivity (see 'Set
the sensitivity of the air quality sensor') to make the purifier
clean the air even better.
button one or
EN 21