Bedienungsanleitung Philips AC4074 (Seite 18 von 20) (Englisch)

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This chapter summarises the most common problems you could

encounter with the appliance. If you are unable to solve the problem with

the information below, contact the Consumer Care Centre in your country.

Problem Possible solution

The appliance doesn’t

work.

You ignored the lter replacement alerts. You did not replace the lter

when the lter replacement 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 operate again.

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 switches off automatically when the air is clean to save electricity.

The fan speed does not

change when the AUTO

mode is activated.

When the room becomes dark, the night mode is activated automatically

when the appliance is in auto mode. In this case, the fan speed is set to a

very low level. If you want to change the fan speed, press the FAN SPEED

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 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: 1) HEPA lter, 2) activated carbon lter, 3) formaldehyde

lter (supplied with AC4074) or multi-care lter (supplied with AC4072),

4) 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 55m², which is the

maximum size at which this appliance can operate effectively.

The colour of the air

quality light ring and the

air quality light always stays

the same.

The air quality sensor is dirty. Clean the air quality sensor (see

chapter ‘Cleaning’).

There is not enough ventilation in the room. Open a window, to improve

the air circulation.

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 appliance clean the air even better.

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