While you wait for answers, we may have found some information which could help you.
Click here for Cooker Hood Changemy hygena app2440 cooker hood needs new button control unit ?
Hygena AP2500 Cooker Hood?
Where can I obtain a Bulb Cover for a Hygena APM 2592 Cooker Hood?
How can i fix the cooker hood Hygena PCB for APP2440?
Hygena Cooker hood - APP2440?
Changing cooker hood fan?