Miele DA 3668 Operating And Installation Instructions page 36

Operation (Manual mode)
Switching Power management on/off
 Switch the cooker hood off. The
deflector plate must be retracted.
 Remove the grease filters.
The controls are accessible via the slots
for the grease filters.
 Press the fan run-on control  for
approx. 10 seconds until the indicator
for power level 1 lights up.
 Then press in turn:
– the lighting control ,
– the  control, and then
– the lighting control .
If Power management is switched on,
the 1 and B indicators light up
constantly.
When it is switched off, the 1 and B
indicators flash.
 Press the  control to turn Power
management off.
The 1 and B indicators will flash.
 Press the  control to switch it on.
The 1 and B indicators will light up
constantly.
 Confirm the setting with the run-on
option control .
All the indicator lights will go out.
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If you don't confirm your selection
within 4 minutes, the cooker hood will
automatically revert to the original
setting.