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Old 02-17-2010, 11:35 AM   #1
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Thermostat or oil burner problem?

I noticed this morning that the house temperature on the thermostat is not equal to the thermostat setting. In other words the heating system (oil fired hot water baseboard) is shutting off before reaching the temp set on the thermostat. The thermostat is a Honeywell RTH7400D programmable. The heating system is kicking on and off periodically and the pipes are warm to the touch throughout the house, it is just staying a degree or two below what it's set on. Pushing the button to temporarily raise the temperature does nothing. Is there a way to know whether this is a thermostat issue or the oil burner has a problem? I can buy and install a new thermostat myself but afraid if it's the oil burner much $$$$ will be involved. Thanks.


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Old 02-17-2010, 02:26 PM   #2
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Buy a Honeywell Focus or Vision Pro at HDepot and install it. Read the install manual and set it for hot water heating.


"Cut it twice and it is still too short".
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Old 02-17-2010, 02:29 PM   #3
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Ayuh,... How long has it been since the boiler was serviced by a technician,..?? This season,..??

My guess is, because you're getting Heat, it's probably a control issue,.. T-Stat,.?. Maybe,..??
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Old 02-17-2010, 05:17 PM   #4
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Or low water pressure.

Look at your boilers gauge. What temp and pressure does it say?
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Old 02-25-2010, 12:05 PM   #5
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been there is putting you on the right track the thermostat just turns the ciculator on and off check pressure and temp readings at boiler
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Old 02-25-2010, 01:44 PM   #6
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does the heat anticipator in the thermostat match the amp setting of the boiler control?


Always ask to see your contractors license!
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