Miele KM 5987 Operating And Installation Instructions page 42

Troubleshooting
... One of the following has occurred:
– The Booster has automatically
de-activated ahead of time.
– The 10, 11 or 12 power level set is
alternating in the display with a lower
power level. The reduced power
level is also represented by the
number of segments in the light ring.
The overheat protection is being
triggered (see the section on "Overheat
protection").
... With the Auto heat function
switched on, the food in the pan
does not cook.
This may be because:
– There is too much food in the pan.
– The cookware does not conduct heat
well.
Select a higher continued cooking
setting next time, or start cooking at the
highest setting and then switch down
manually to a lower setting later on.
... The cooling fan continues to run
after switch-off.
That is not a malfunction. The fan runs
until the appliance is cooled down, and
then switches off automatically.
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... Numbers light up in the timer
display and A, F and numbers light up
in the cooking zone display, when
the cooktop is switched off.
The sensitivity of the sensors has been
altered and they cannot recalibrate
automatically. Recalibration must be
performed manually (see "Calibrating
the sensor switches").
Should the problem still persist, please
call customer service.
... An F , appears in the left cooking
zone display, and an E in the right,
and numbers appear in the timer
display.
Interrupt the power supply to the
cooktop for approximately 1 minute.
If the problem persists after power is
restored, please call customer service.