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  1. #1

    Lennox G60UHV-36B-090

    Any idea as to why this furnace would need the flame sensor cleaned or replaced every month?

  2. #2
    Join Date
    Nov 2012
    Location
    PA
    Posts
    50
    Is the furnace dirty and sucking in a lot of dust? Is there something in the air that could be burning to it? What are you using to clean it with? Don't use sand paper. I just use a small wire brush.

  3. #3
    Join Date
    Dec 2007
    Posts
    4,670
    as other may chime in on, it may be a poor ground.

    flame sense happens with/in the ground path.

    if it is truly monthly, I would have tried a new flame sensor after the second trip. also, verified ground and maybe new board.
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  4. #4
    I highly doubt it needs a new flame senor, it is probably the method you are using to clean it. Use low abrasive steel wool. (Not sand paper) Also if the furnace is in a laundry room that could be your issue, lent and silicone base fabric softener in the air will coat the sensor. Check for voltage across "c" and neutral, voltage should be 0 if you have a good ground. Flame sensors don't go bad , It is simply a metal rod insulated with porcelain. A clothes hanger could be a flame sensor if you could mount it without grounding it.

  5. #5
    Join Date
    Jan 2011
    Location
    Highland Park, CA
    Posts
    73
    Check the grounding. From the receptacle through your furnace/board/burners. Must have good earth ground.

  6. #6
    Join Date
    Jul 2012
    Location
    Cincinnati ohio
    Posts
    252
    Quote Originally Posted by joeblo View Post
    Is the furnace dirty and sucking in a lot of dust? Is there something in the air that could be burning to it? What are you using to clean it with? Don't use sand paper. I just use a small wire brush.
    A wire brush is still too abrasive. I use a dry shop rag. If that doesn't raise the Reading then you probably have other factors, dirty burner face, ground, gas pressure...

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,771
    Quote Originally Posted by Dean11 View Post
    Any idea as to why this furnace would need the flame sensor cleaned or replaced every month?

    What have you checked, and eliminated as the cause.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  8. #8
    Join Date
    Jun 2006
    Posts
    27
    Ive seen this issue a few times with that model. The furnaces I ran into with this issue were almost always located near a laundry area and were just a few years old. I ended up finding out lennox makes an alternative flame sensor for this model that they said is more robust. I cant recall the part number but lennox should be able to help you if you have ruled out ground issues.

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