If you select fan oven, then turn on stat (no temp light) nothing happens, have checked stat, it is not switching off, running closed circuit (faulty) so the temp light should be on all the time- which it isnt, but if I select the grill switch, the fan runs and the same stat starts to work and heats. I am a bit lost as to dianose fault,, as there are three switches interlinked… Including the stat. can anyone point me in the right direction. please John