Miele DA 420 V Operating And Installation Instructions page 20

Operation
Setting and altering the charcoal
filter operating hours counter
(with recirculation mode)
The charcoal filter is needed for
recirculation mode.
The rangehood is set at the factory for
extraction mode. On delivery, the
operating hours counter for the
charcoal filter is set to unlimited.
For recirculation mode, the operating
hours counter needs to be set to the
required time:
^ Press the On/Off touch control to
switch the fan off.
^ Press the run-on option touch control
and the charcoal filter touch control
at the same time.
The indicator lamp for the charcoal filter
touch control and one of the lamps
above the – / + touch controls will flash.
The – / + control lamps show the time
which has been set:
1st lamp from the left = 120 hours
2nd lamp from the left = 180 hours
3rd lamp from the left = 240 hours
4th lamp from the left = unlimited
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^ Use the – / + touch controls to select
the desired time.
^ Confirm the selection by pressing the
charcoal filter touch control.
All the indicator lamps will go out.
If you do not confirm your selection
within 4 minutes, the rangehood will
automatically revert to the original
setting.