Miele DA 420-4 Operating And Installation Manual page 20

Operation
Reading the operating hours counter
for the charcoal filter
To check the percentage of time set
already used:
^ Press the On/Off control to switch the
fan on.
^ Press and hold the charcoal filter
control.
One or more of the indicator lamps for
the – / + controls will flash.
The number of flashing lamps shows
the percentage of the operating time
which has already been used up.
1 lamp = 25 %
2 lamps = 50 %
3 lamps = 75 %
4 lamps = 100 %
The number of operating hours used
remains in the memory, even when the
appliance is switched off or there is a
power cut.
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