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    stanen8871's Avatar
    stanen8871 Posts: 1, Reputation: 1
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    #1

    Mar 22, 2009, 07:25 AM
    Thermostat / heater
    I have a honeywell th8000 thermostat and a rheem gas heater /ac system.
    I have a intermittent problem where the temp goes below the stat setting and heater does not come on. I have to turn the heater off from the stat and back on again and it will run fine. This happens once in a while night or day, mostly night. Could this be the stat or the heater?

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    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    Mar 22, 2009, 08:05 AM
    Could be either, but don't rush to blame the thermostat. If the furnace malfunctions and activates a timed lockout, the action of switching the thermostat off/on will cancel the lockout. Look for diagnostic LEDs on the furnace that may provide clues.
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