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How can I fix my Hygena APP2400 Canopy Extractor?

I get no response at all from the front panel switches and the lights are permanently on. I have stripped the switch unit and physically checked the control cct board can hear the switches clicking, but can't proceed any further.
Any answers of help out there?
Kambanji, August 2012
had the same problem, have replaced the main circuit board as it appears to be a failure there

Handyal, June 2014
link Click here to see other fixes for Hygena APP2400.