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    bbcolton924's Avatar
    bbcolton924 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Sep 10, 2009, 12:45 PM
    GAS furnace coming on when its off
    Gas furnace
    Keeps cycling on for 30 secs and it is not on -----the thermostat is not on- we are not using heating or a/c
    medic-dan's Avatar
    medic-dan Posts: 321, Reputation: 23
    Full Member
    		  
    #2

    Sep 10, 2009, 03:02 PM

    The volunteer fireman part of me says...

    Just as a safety item, turn the furnace off at the "emergency" switch or the circuit breaker box. I don't know what's going on but you don't need to deal with a fire.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #3

    Sep 10, 2009, 04:06 PM

    What brand and model of furnace is it? Are the burners igniting, or just the draft inducer comes on, or just the blower comes on? Sounds to me like a fualty fan/limit switch, or thermostat, or control board. I suggest you have in a pro to locate problem,, and as medic suggested, shut power to furnace off until they get there. Good luck and please let us know what they find.
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