English 17
-Filter replacement light 1 flashes: filter 1 (the
-Filter replacement light 2 flashes: filter 2 (the formaldehyde filter (supplied with AC4074) or
-Filter replacement light 3/4 flashes: the activated carbon filter and the HEPA filter have to be replaced.
Note:The HEPA filter and the activated carbon filter have a similar lifetime. Therefore they have to be replaced at the same time.
Filter replacement lock
If you do not replace the filter in time, the appliance stops operating approx. 2 weeks after the filter replacement light started flashing.When the appliance is locked, it does not operate until you have replaced the full filter and pressed the reset button.
Note:When filter 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 filter replacement alert. Approximately 1 day before the appliance locks, it beeps every 30 minutes to inform you that one of the filters 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:
1Check which filter needs to be replaced (see section ‘Filter replacement alerts’).
2Switch off the appliance and unplug it.
3Replace the appropriate filter (see section ‘Replacing the filters’).
