Miele DA 6996 W Operating And Installation Instruction page 30

Cleaning and care
After cleaning
 After cleaning, leave the grease filter
to dry on an absorbent surface before
refitting it.
 When removing the panel and the
grease filter for cleaning, also clean
off any residues of oil or fat from the
now accessible housing to prevent
the risk of these catching fire.
 Refit the moisture collection tray.
 Refit the grease filter, making sure
that the locking clip is facing down
towards the cooktop.
 If a grease filter is inadvertently
refitted upside down, insert a small
screwdriver blade into the slit to
disengage the clip.
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 Hook the panel in at the top and then
push it into position at the bottom.
Resetting the grease filter operating
hours counter
After cleaning, the operating hours
counter needs to be reset.
 While the fan is switched on, press
the operating hours control  for
approx. 3 seconds until only 1 is
flashing.
The grease filter symbol  goes out.
If you want to clean the grease filter
before the operating hours counter has
reached its maximum:
 Press the operating hours control
 for approx. 6 seconds until only
1 is flashing.