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My boiler in the cellar goes on even if the thermostat is all the way off?

I thought that the thermostat may be faulty so I disconnected it and the wires are hanging but not touching and it still fires up on is own
Where could the problem be?

Paul
September 2011
Heating, Home Heating SystemsHeating Fault System
no bill i don't

paul
September 2011
Have you got a frost thermostat in the cellar near the boiler? Could be set too high or faulty

bill
September 2011

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