I have a built in lightly used 12 year old De Dietrich downdraft extractor (model DHD7000X).
There is power going to the unit but the unit will not work and there are no lights working on the top plate of the unit.

Any ideas

Steve Mac, October 2022

Further to the above also change the door switches as they are prone to moisgure available from https://www.switchelectronics.co.uk/

Joe, February 2023

Do the leds glow when you apply power to the unit? If so power is present. I took my unit out and thoughly cleaned all the gunk that had built up over the years with a brush and degreaser I then cleaned all the inductive sensors ...it started working I just need to calibrate the rise and fall limits again.

Joe, January 2023