Miele DA 428-4 EXT Operating And Installation Instructions page 18

Operation
Reading the operating hours counter
for the grease filters
To check the percentage of time set
already used:
^ Press the On/Off touch control to
switch the fan on.
^ Press and hold the grease filter touch
control.
One or more of the indicator lamps for
the – / + touch controls will flash.
The number of flashing lamps shows
the percentage of the operating time
which has already been used up.
1 lamp = 25 %
2 lamps = 50 %
3 lamps = 75 %
4 lamps = 100 %
The number of operating hours used
remains in the memory, even when the
appliance is switched off or there is a
power cut.
18
Altering the operating hours counter
for the grease filters
The operating hours counter for the
grease filters is set at 30 hours. This
can be lengthened or shortened to suit
the type of cooking you do. You can
choose 20, 30, 40 or 50 hours
– Select a short time if you roast or fry
a lot.
– If you use very little fat for cooking,
select a longer time.
– If you only cook occasionally we
recommend that you still select a
short time, because grease which
has built up gradually over a long
period of time will harden on the
grease filters and make cleaning
more difficult.
^ Press the On/Off touch control to
switch the fan off.
^ Press the run-on option touch control
and the grease filter touch control at
the same time.
The indicator lamp for the grease filter
touch control and one of the – / +
indicator lamps will flash.