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Mend Halstead Best 40 Gas Boiler Home Heating Thermostat

why is my halstead best 40 boiler on all the time?

i have a halstead best 40 gas boiler that fires up & stays on even though all external time controls & thermostat are off.got me baffled any ideas ?

kev.b
March 2012
HalsteadHalstead Best 40Heating, Home Heating SystemsGas Boiler Home Heating Thermostat

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