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    ddfox2's Avatar
    ddfox2 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 12, 2008, 08:27 PM
    Comfortmaker GUA080A012AIL Furance
    Furance Starts up and runs for Approx 15 minutes then shuts off before reaching the thermostst temperature setting. After the furance shuts off I can restart it, but each time the furance runs, it runs for a shorter time. I know it's not the thermostat and it has an electronic ignition. Does this furance have a high limit temperature sensor that may be bad? If it does have this sensor, where is it located?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Nov 13, 2008, 01:21 AM
    All registers open and not blocked?
    All return airs open and not blocked?
    Air filter clean?

    Check this first.
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