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Truma C heater programmable timer


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I have a truma Combi C blown air heating system fitted to my 2002 motorhome. I thought it would be a good idea to fit a 12 volt programmable timer so that the heating would come on in the mornings. I have wired it to the 12 volt supply to the heater and not the thermostat. When the timer comes on the red failure light also comes on, on the stat. If I wire it to the stat I am not sure which wire it would be . Does anyone have a wiring diagram or any ideas. The new Truma timer is not compatible with older Truma C boilers.



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