Miele DA 249-4 Operating And Installation Instructions page 22

Cleaning and Care
Replace the active charcoal filter when
the charcoal filter indicator lights.
Replace the filter at least every
6 months or when it no longer absorbs
odors efficiently.
The old charcoal filter can be disposed
of in the household waste.
^ After replacing the charcoal filters,
press and hold the charcoal filter
button for about 3 seconds to reset
the charcoal filter timer.
The indicator light will go out.
^ If the charcoal filters are replaced
before the timer has reached its
maximum, the charcoal filter button
should be pressed for 6 seconds to
reset the counter to zero.
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