While you wait for answers, we may have found some information which could help you.
Click here for Button Unit BoughtHow can i fix the cooker hood Hygena PCB for APP2440?
my hygena app2440 cooker hood needs new button control unit ?
hygena app2410 cooker hood?
replacement hygena app2420 cookerhood. ?
Hygena Cooker hood APM2591?
Hygena APP2420 fan cuts outer after 5 mins?