Question about Honeywell Programmable Thermostat Heater

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Thermostat does not follow the setting

Despite the temperature being set to a desirable degree, the furnace keeps running non stop; thermostat should be manually turned off in order to stop the furnace. Temperature is running up as well, making it sweltering hot inside. The reading seems to be accurate. Batteries are fresh.

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  • marianna88 Feb 15, 2009

    Thank you for trying to help. The thermostat is about three y.o., and it is the first winter when we have the problem I described. Heating is hot water baseboard/oil furnace. I hope it helps. And one more thing:heating in the house is zoned ( we have three identical thermostats. Problem with only one of them. I will try to switch boxes and see what will happen.) Thanks!

  • marianna88 Feb 15, 2009

    Sorry, I wasn't clear. The second.

  • marianna88 Feb 15, 2009

    You're right, baseboards should be checked, I'll see to it. My stat's behavior is a bit mysterious. Will keep you posted. Thanks!!

  • edgek44 Feb 16, 2009

    I just attached the thermostat wires to the new terminal (Honeywell RTH221B) this evening and the furnace (nat gas forced water) runs continuously -temp keeps climbing well past set temp. The only thing that seems to shut the furnace down is to disconnect the wires. Reconnecting the wires immediately turns on the furnace.

  • Mark Egan May 11, 2010

    It would surprise me that the thermostat is constantly calling for heat. Thermostats designed to shut-down once the temperature exceeds an excessive temperature as anything more than that is not good for humans.

    But check it out to be sure, and, make sure the baseboard heat is operating properly.
    Your suggestion to swap with other stats is a good one though. See if the problem travels with the stat, or stay with the unit.


  • Mark Egan May 11, 2010

    Does this thermostat control both the baseboard heat, and the oil furnace

    I assume the oil furnace is a forced air type of heat? Or, are you calling the oil furnace the oil fired water heater, where the water is used in the baseboard heat coils?


  • Mark Egan May 11, 2010

    Please clarify -

    Is this a newly installed thermostat?
    Has the system ever worked correctly?
    Is the heating electric, gas, or heat pump/heat pump with electric heat backup?



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If the thermostat is a digital /programmable you may want to recheck program to see if it has changed or been changed. If thermostat is not digital then it is prbably warn out and need replaced.

Posted on Feb 16, 2009

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