I have a Hygena Extractor Fan Model APP2440 which is old. It just stopped working when in use so the extractors fan are no longer rotating. The 2 internal lights for cooking still work though. Tried placing a new 3 amp & 5 amp fuse into the unit to no avail as the fans didn’t start to rotate again . Does anyone know what is wrong with this unit, how to repair, what spare parts are needed if any and if a repair is required how much would it be including VAT? thanks