Philips AC4004 User Manual

Problem

Possible solution

The appliance still 

indicates that I need 

to replace a filter, but I 

already did.

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 I press the SLEEP 

button, all lights except 

for the SLEEP light go out.

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 appliance stops 

operating, although the 

power-on light is still on.

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.

The appliance does not 

work. The air quality light 

ring flashes blue, all other 

lights are out.

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.

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