Miele DA 249-4 EXT Operating And Installation Instructions page 26

Cleaning and care
Always replace the filter immediately if
the lamp for the charcoal filter touch
control comes on, or if it is no longer
effective in absorbing kitchen odours.
It should be replaced at least every 6
months.
Used charcoal filters can be disposed
of with the normal household waste.
^ After fitting a new charcoal filter,
press the charcoal filter touch control
for approximately 3 seconds to re-set
the operating hours counter.
The indicator lamp will go out.
If a charcoal filter is replaced before the
operating hours counter has reached
its maximum, the charcoal filter touch
control should be pressed for
approximately 6 seconds to reset the
counter.
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