Boiler keeps running after reaching thermostat temp

Old 11-23-08, 11:33 AM
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Boiler keeps running after reaching thermostat temp

I have a steam boiler for which I replaced the thermostat six months ago. Yesterday the boiler kept on running until I shut off the emergency switch. I assume that either the thermostat OR the relay is the problem. Is there a way to test? Right now it's working fine.
Old 11-24-08, 10:04 AM
Join Date: Sep 2006
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just turn the tstat up till the boiler starts then turn it down below the current temp and it should stop. If you turn it down like 5 deg below the temp and it still does not stop then it is either configured wrong or defective. It could be a frozen relay like you said. You would need to remove the 24v input and if it stays closed you know where your problem is.

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