Hi, my friends thetford SES f/ f has stopped working on mains leccy ?.He has a Bessacarr E789.When you turn it on Auto the mains symbol comes on for a few seconds then switches to gas.I'm assuming that the 5 amp fuse is ok because the fridge light comes on. Any pointers on where the 5 amp fuse is for future reference or is it a job for a service engineer .Cheers.