Miele KM 451 Operating Instructions Manual page 23

The cooktop will turn off automatically if
any of the touch controls are covered
for more than 10 seconds, for example
by finger contact, food boiling over, or
by an object such as an oven mitt or
towel.
When the cooktop turns itself off a tone
will sound every 30 seconds (for a
maximum of 10 minutes) and an F will
flash in the display of the touch control
which was covered.
^ Clean the control area or remove the
object covering the touch control.
This will turn off the tone and the F will
go out.
^ Turn the cooktop back on again with
the s "ON / OFF" touch control .The
burners can now be used.
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