The window contact switch batteries are flat.
Change the window contact switch batteries.
Support for yourHob
Vapour extraction not working (KMDA 7774, KMDA 7774-1, CSDA 1040)
Vapour extraction for the hob does not work (KMDA 7774, KMDA 7774-1, CSDA 1040). If the window contact switch battery is flat, the window contact switch does not transmit any signal to the receiver. The window contact switch does not enable any voltage for operating the vapour extraction. Vapour extraction therefore does not work.
The circuit breaker has tripped.
Check whether the circuit breaker has tripped.
Vapour extraction still does not work.
Please contact the Miele Customer Service Department.
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