The little green light on the control which does both temperature and Supply settings is powered from the pcb board behind the fire. This is a 12v supply powered by a transformer only from this board . The pcb board itself is powered from the mains and if no 240V then you will NOT get a green light , because there is no imput.
Why no imput? As mentioned the 240V supply comes from RCD and sometimes this goes to a separate switched fuse (ie, which gives a red light when turned,on)
This connection does not always , as in the case with my caravan ,have a separate 240V switch with a neon light. It goes to the pcb via a in-line connector to the supply from the pcb.
So we have two senarios either a faulty switch connection or fuse in the 240v Supply line , OR the fire IS getting a 240V supply and the transformer on the pcb is blown which in turn means NO green light on the thermostat dial.
On my van the connection to the 240V supply was a straight in line connector which was beneath the wardrobe floor. So in the first instance check the fire is receiving 240V.
arc systems has wrote in detail about these fires and their faults for many many years, so really just passing on what I have learnt.
Hope this helps a little bit. Regards Vin
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Topic: Truma Ultraheat Problem
