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Note: The time between the lter replacement signal and the locking of the
appliance varies, depending on how often you use the appliance.
Note: When the power on/off light, lter replacement light 2 or 3/4 and the
‘REPLACE FILTER’ light are on continuously, the appliance is locked (see section
‘Filter maintenance’ in this chapter for more information).
Approximately 1 day before the appliance locks, it beeps every 30 minutes
to inform you that one of the lters needs to be replaced.
When the appliance is locked, you hear a beep when you press any button.
You can switch off the appliance by pressing and holding the on/off button.
If the appliance is locked:
1 Check which lter needs to be replaced (see section ‘Filter cleaning
light and lter replacement lights’ above).
2 Switch off the appliance and unplug it.
3 Replace the appropriate lter (see section ‘Replacing the lters and
resetting the appliance’ below).
Tip: Place the appliance against a wall for more stability when you remove or
insert lters.
1 Switch off the appliance and unplug it.
2 Place your ngers in the recesses of the side panels and gently pull
the bottom part of the front panel towards you. Then lift the hooks
at the top of the panel out of the top of the appliance.
3 To remove lter 1 (pre-lter), grab the two projections and pull the
lter towards you.
4 AC4004 only: remove lter 2 (multi-care lter) from the back of the
pre-lter.
1
2
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- Filter replacement light 1 ashes: lter 1 (the pre-lter) has to be
cleaned. See chapter ‘Cleaning’ for further instructions.
- Filter replacement light 2 ashes: lter 2 (the formaldehyde lter
(supplied with AC4074) or multi-care lter (supplied with AC4072))
has to be replaced.
- Filter replacement light 3/4 ashes: the activated carbon lter and the
HEPA lter have to be replaced.
Note: The HEPA lter and the activated carbon lter have a similar lifetime.
Therefore they have to be replaced at the same time.
Filter replacement lock
If you do not replace the lter in time, the appliance stops operating
approx. 2 weeks after the lter replacement light started ashing.When the
appliance is locked, it does not operate until you have replaced the full lter
and pressed the reset button.
Note: When lter replacement lights 2 or 3/4 and REPLACE FILTER on the
control panel are on continuously, the appliance is locked (see section ‘Filter
maintenance’ in this chapter for more information).
How long it takes before the appliance is locked depends on the operating
time and speed level selected after the lter replacement alert.
Approximately 1 day before the appliance locks, it beeps every 30 minutes
to inform you that one of the lters needs to be replaced.
When the appliance is locked, you hear a beep when you press any button.
You can switch off the appliance by pressing the on/off button.
If the appliance is locked:
1 Checkwhichlterneedstobereplaced(seesection‘Filter
replacementalerts’).
2 Switchofftheapplianceandunplugit.
3 Replacetheappropriatelter(seesection‘Replacingthelters’).
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AC4072-4074_um_120424.indd 19 24/04/2012 15:47:36