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

    Dec 18, 2006, 08:30 AM
    Need help w/ Lennox (burrr)
    I have a Whisper Heat by Lennox furnace, approximately 15 years old, model #G20Q3E-50-2, running on natural gas.

    Early in the season I had trouble where pilot would light for a couple seconds and go out, without ever lighting the main burners. Was told to check out the flame sensor, I did and it was rusty and the ceramic portion had cracks in it. I replaced the flame sensor and furnace worked fine for a couple of weeks and now the pilot will light for a few seconds, then the main burners will kick on and stay lit for around 5-8 seconds and go out.

    I can sit there and when the main burners go out turn off the power to the furnace, wait a few seconds, and turn the power back on (sometimes it takes several attempts) it will eventually keep running.

    I am afraid for the day when it just doesn't run. Luckily so far this has been a pretty mild winter, but I know worse is yet to come. Any help would be greatly appreciated.

    John
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #2

    Dec 18, 2006, 09:04 AM
    Is there a second flame detector for the main burner? Also check the connections for the one you replaced. Is it in the right position?
    jhinferrmashun's Avatar
    jhinferrmashun Posts: 3, Reputation: 1
    New Member
    		  
    #3

    Dec 19, 2006, 09:18 AM
    I have checked the connections and they seem clean and secure. I don't see a second flame sensor, unless I am just looking in the wrong area. The way the flame sensor is attached I don't think I could have changed its position.

    Any other help would be appreciated.

    Thank You
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #4

    Dec 20, 2006, 06:39 AM
    There is only one flame sensor. Is there a diagnostic light on the PC board flashing any codes?
    jhinferrmashun's Avatar
    jhinferrmashun Posts: 3, Reputation: 1
    New Member
    		  
    #5

    Dec 20, 2006, 11:20 AM
    No, I don't see any light anywhere on the unit.
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