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Thread: Lennox C23-41-1 Flame is traveling out of the heat exchange area and trigs heat sensr

  1. #1
    Join Date
    Jan 2016
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    1

    Default Lennox C23-41-1 Flame is traveling out of the heat exchange area and trigs heat sensr

    *** HELP **** The heat sensor keeps shutting off on my Lennox C23-41-1. Cleaned flame sensor and started the furnace back up. I noticed there are flames traveling outside of where it's supposed to be and then triggers the flame sensor (as it should). It sit only happening on the 2nd burner tube from the left. What do I need to do? Could there be a blockage somewhere? Please let me know A.S.A.P. Cold up here in the Midwest and snow storm coming!!!
    Last edited by bfriedl; 01-24-2016 at 04:37 PM.

  2. #2
    Join Date
    Feb 2012
    Location
    Lala land, OH
    Posts
    235

    Default

    Quote Originally Posted by bfriedl View Post
    The heat sensor keeps shutting off...
    What is a heat sensor? Newer furnaces have several different sensors. Attaching a pic of the sensor so we can see where it is can help.


    Lennox C23-41-1. Cleaned flame sensor and started the furnace back up.
    Does your furnace have a flashing LED or display to indicate a fault condition? If so, what is the code. I don't have a manual for this furnace and without a FULL model number, I wont be able to look for one. Look in your manual or on a troubleshooting guide on the backside of a cover and let us know what it says for the code you have. This code does not tell you what part is bad, it tells you what part detected a problem. The cause could be elsewhere. Also, some codes (such as ignition related) will not set on the first occurrence. Some take repeated occurrences within a window of time to set.

    I noticed there are flames traveling outside of where it's supposed to be and then triggers the flame sensor (as it should).
    What is where it is supposed to be? We need *MUCH* more detail, otherwise we wont be able to help. Post pictures if needed.

    It sit only happening on the 2nd burner tube from the left. What do I need to do?
    I have no idea what you are asking. Is the furnace running, or shutting down with a LED code? Are you referring to the correct sensors? A flame sensor is a thin wire that detects that the burner successfully lit, so that the furnace does not continue to pump gas into the combustion chamber (or your house). There are also rollout sensors that detect a flame rollout which is flame leaving the combustion chamber. Depending on the age of your furnace you can none to several of these.

    Please post more detail, pictures, codes, model numbers, etc.

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