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

    Jan 20, 2008, 06:40 PM
    Gas furnace
    Hi, I have a sears 80,000 btuh furnace model #76902 [condensing gas] and the problem I am having is the main burners fire, stay on for about 45 seconds and shut off, any idea what could be the problem?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 20, 2008, 08:48 PM
    Clean the flame sensor.
    therinnaiguy's Avatar
    therinnaiguy Posts: 153, Reputation: 5
    Junior Member
    		  
    #3

    Jan 21, 2008, 06:48 AM
    Also check the condensate lines and pump (if you have one). Check your air filter as well.
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