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    sabbat's Avatar
    sabbat Posts: 1, Reputation: 1
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    #1

    Mar 10, 2007, 02:53 PM
    Furnace continues to heat past the desired temp. setting
    I have a gas furnace with an AC unit. My wife wanted to replace the old mercury thermostat with a new digital model. We bought a Honeywell RTH230B. Now the furnace continues to heat, well past the set temperature on the thermostat. I have to switch the thermostat to the off position to get the furnace to stop heating. I suspect the AC will do the same thing but I'm not sure since it's cold here now and I don't want to try it yet. Is there a chance that I bought the wrong kind of thermostat? Any help would be greatly appreciated.

    Wayne
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #2

    Mar 11, 2007, 09:40 AM
    Read the owners manual about set temperature differential.
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