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Switching all cooking-zones off:
To turn all the cooking zones off at once, touch the key.
In the stand-by mode, an H appears on all cooking zones which are hot.
Residual heat indicator:
Residual heat indicator indicates that the glass ceramic has a dangerous touch
temperature in the circumference of a cooking zone.
After switching off the cooking zone, the respective display shows H until the
assigned cooking zone temperature is in an uncritical level.