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

    Nov 3, 2008, 10:21 PM
    Gas furnace locks out.
    My gas furnace ignites for a few seconds then it stop. It does this cycle 4/5 times then locks out. Blower works fine in "on" or "auto". Red light flashes by the ignition module after it locks out. I pulled out the tube at the pressure switch (one tube, two wires model) and the red light turns off. Is this a pressure switch problem?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Nov 3, 2008, 11:20 PM
    Clean the flame sensor with some sand paper. Flame sensor located next to or near ignitor.
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