While you wait for answers, we may have found some information which could help you.
Click here for De Dietrich ModelHygena APP2420 fan cuts outer after 5 mins?
Who can mend it?
De Dietrich downdraft extractor (model DHD7000X?
Lights stop working?
How can I mend my cooker hood?
Indesit cooker hood H593 IX - help needed re PCB fuses?