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

    Mar 22, 2008, 09:00 AM
    Furnace blowing cool air
    I have a Trane XL80 furnace, the past couple weeks I have had blower running but no heat. System shows 2 flashes: System Lockout (No flame) check line polarity.
    If I shut off switch (by fuse) then turn back on, it will ignite (but might take a couple ignites, if after 5 X's and burners do not stay lit, it will lockout again. The burners will light for 3 - 10 seconds then go out. Any suggestions on cause?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Mar 22, 2008, 11:33 AM
    If you have a flame sensor clean it or replace.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
    		  
    #3

    Mar 22, 2008, 07:48 PM
    I agree start with cleaning the flame sensor. If all the burners are not lighting or slow to light it will give you the same code also. The only time you need to replace the flame sensor is if you broke the metal rod off or if the ceramic is broke or cracked on it.
    PITTPSU's Avatar
    PITTPSU Posts: 3, Reputation: 1
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    #4

    Mar 23, 2008, 05:05 AM
    Quote Originally Posted by hvac1000
    If you have a flame sensor clean it or replace.
    I removed sensor, cleaned with scotchbrite pad, replaced. 1st ignition stayed on.
    So far, so good. Thanks!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #5

    Mar 23, 2008, 06:08 AM
    Glad you got it fixed.
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