Humidity controller for Vort Kappa kitchen ceiling extractor

I had the Vort Kappa [made by Vortice] tested so motor and capacitor are fine, the wall humidity panel trigger ceiling fan for 1 second than cut off. At time when fan unit stop working, i removed the cover [with PCB] when turning the humidity level wheel a green light spark, this happen few time when testing level of trigger humidity level. The green light flashing inside the PCB has stop, now when turning wheel to lower level to test humidity level, it start but doesn't hold more than a second and start again. Is the PCB faulty and what component need to be replaced. Thank you Phil