Miele CERAMIC COOKTOP WITH INDUCTION KM 5753 Operating And Installation Instructions page 22

Use
Single booster (all burners)
^ Turn on the relevant burner.
^ Select a power level.
^ Take your finger off the sensor.
^ Touch the + and - sensor briefly at
the same time.
The indicator for the booster will light
and I will appear in the burner display.
If power level 9 was selected, the
booster can be activated by
touching the + sensor only.
22
Double booster (front left burner
only)
^ Turn on the relevant burner.
^ Select a power level.
^ Take your finger off the sensor.
^ Touch the + and - sensor briefly at
the same time.
The indicator for the booster will light
and I will appear in the burner display.
^ Touch the + and - sensor briefly at
the same time again.
II will appear in the burner display.