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I have not had heat in almost 24 hours. My thermostat (an old Honeywell Chronotherm) doesn’t seem to want to kick on the boiler. I have this house for two years and the boiler for one and have never had any problems until now. Can this possible be an issue with how the thermostat is set (it has fresh batteries although I don’t think that is a factor anyway) or is it time for a new thermostat? I can’t believe this is a problem with the boiler.

Any advice is greatly appreciated.