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    youknowitdadio's Avatar
    youknowitdadio Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Nov 19, 2008, 11:37 PM
    Lennox heater will not turn off
    Rooftop Central AC and heat unit gets stuck on when heater is left on for a few hours in winter months. Only way to turn it off is to throw the breaker off then back on.
    Specs:
    Lennox
    model # gcs10x-511-75-1p

    Could this be a fan relay? Contactor relay?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Nov 19, 2008, 11:55 PM
    Depends upon what is sticking. Contactor for the entire unit or relay for just the fan. The thermostat wires could also be causing a problem if they somehow got damaged.
    youknowitdadio's Avatar
    youknowitdadio Posts: 3, Reputation: 1
    New Member
    		  
    #3

    Nov 20, 2008, 09:45 AM
    AC turns off, so it must be a fan relay. It's only with the heat after it's been turned on for 4 hours or more. I was just in there replacing the condenser fan and things looked OK in that area. I didn't see any damaged wires anywhere. This problem was before I had gotten in there so I know it wasn't me that caused the problem. I'll order the fan relay and see if that does the trick. Thanks for the advice. :cool:
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