Miele DA 400 EXT Operating And Installation Instructions page 21

Always replace the charcoal filter imme-
diately if
– the indicator lamp for the charcoal
filter touch control lights up,
or
– if it is no longer effective in absorbing
kitchen odours.
It should, however, be replaced at least
every 6 months.
Used charcoal filters can be disposed
of with the normal household waste.
^ After fitting the new charcoal filter,
press the charcoal filter touch control
for approx. 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 approx. 6 seconds to reset the
counter.
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