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  1. #1
    Join Date
    Jan 2013
    Location
    The Cheese State
    Posts
    92

    Exhaust flue smell

    Went on a call Friday on the homeowner's complaint of smelling gas(NG) smell from furnace exhaust outside. I could not find anything at all wrong or out of spec. O2 and CO readings were all within normal range, intake pipe was all clear. Furnace is a lennox slp98 installed last as april and in the home owners defense I smelled it as well when I arrived. After I took gas pressures (all perfect) I took the burner box cover off and ran for 10 min then went out by termination, I'm very puzzled as to a reason for this as was tech support. Any input would be great.
    Thanks

    Sent from my HTC Hero S using Tapatalk 2

  2. #2
    Join Date
    May 2011
    Location
    Western, KY
    Posts
    2,894
    Pop the exhaust pipe off and look for black substance in pipe, could be plugged secondary.

  3. #3
    Join Date
    Aug 2011
    Location
    Ontario
    Posts
    381
    If you have delayed ignition for whatever reason you may get a bit of raw gas passing through system on start up. Check burners and travel pilot. If HSI not getting hot enough, raw gas can pass before ignition.
    There is no bad beer, some just taste better than others.

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