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Caravan & motorhome technical questions

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Question

Hi the fan on my trumatic ultraheat, is only working on idle speed I have replaced the control switch on the top left of the fire,teb2 version with 1-5 control speed and manual and auto setting, on turning the dial the fan does not speed up, could it be the pcb on the back of the fan?

Answer

Yes, the PCB on the fan housing is the most likely cause of the problem.