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Gas Boiler will supply /fire up to supply Central heating When Room thermastat turned up and switched to Heating and Hot water. When on Hot water Only will not fire up even though thermostat on hot water tank is set correctly. Is this a faulty Thermosta on the tank ?

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Most likly or a shorted wire unhook the wire from the boiler see if it stops then if it's still is on it's in the boiler if off try unhooking it at the t-stat on the heater this should narrow it down for you dan

Posted on Jul 19, 2008

  • dan covey Jul 19, 2008

    could be. unhook the water heater wire at the boiler if it stops then try the same at the t-stat on the heater if it still runs with it unhooked at the boiler its internat dan

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