Philips AC4076, User Manual

19

ENGLISH

Problem

Possible solution

The air quality does 

not improve, even 

though the appliance 

has been operating 

for a long time.

•  One of the filters has not been placed in the appliance. 

Make sure that all filters are properly installed in the 

following order, starting with the innermost filter: 1) high-

efficiency formaldehyde removal HEPA filter, 2) pre-filter.

•  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 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.

The appliance is extra 

loud.

•  Please check if you have removed all the packaging material 

from the filters.

•  If the appliance is still too loud; you can change the fan 

speed to a lower fan speed level.

The appliance still 

indicates that I need 

to replace a filter, but I 

already did.

Perhaps you did not press the filter reset button properly. Plug 

in the appliance, press the on/off button and press the filter 

reset button with a flat tool.

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 starts 

running at a low fan speed and noise level so that the energy 

consumption is minimised.

The appliance does 

not work. Fan speed 

lights 1 and 2 flash, all 

other lights are out.

This is a component defect. 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.

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.

The air quality light 

ring keeps flashing 

purple.

This is a gas sensor error. Switch off the appliance and unplug 

it. Take the appliance to your Philips dealer or an authorised 

Philips service centre.