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    Todrick's Avatar
    Todrick Posts: 2, Reputation: 1
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    #1

    Dec 3, 2007, 09:32 PM
    6yr old Bryant furnace burner continually on-off-on-off
    After the furnace heats to the desired setting of the thermostat the gas flow to the burner stops and starts every few seconds with the igniter also starting and stopping. Igniter is 2yrs. Old and won't last long operating like this.
    kp2171's Avatar
    kp2171 Posts: 5,318, Reputation: 1612
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    #2

    Dec 3, 2007, 09:51 PM
    Mine cycled on and off but at the beginning of the program... that is, the thermostat would tell the furnace to kick on, itd ignite, then within 10 secs the valve would shut down, and the cycle would start over again. Cleaning the flame sensor fixed my problem, at least so far... furnace didn't sense that the flame was present when it was and it kicked the gas off and tried again...

    But you are saying that it'll follow the program until it hits the desired temp and then it just cycles on and off?
    Todrick's Avatar
    Todrick Posts: 2, Reputation: 1
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    #3

    Dec 4, 2007, 09:41 AM
    I cleaned the flame sensor and seems to be working fine. Thanks for the help.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #4

    Dec 4, 2007, 10:28 AM
    Hummmmmmmmmmm! A lot of that around. I have a 12 year old Bryant 80+. I wonder if I should clean it before cold weather sets in, or leave well enough alone? If it ain't broke, don't fix it?
    kp2171's Avatar
    kp2171 Posts: 5,318, Reputation: 1612
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    #5

    Dec 4, 2007, 11:17 AM
    Quote Originally Posted by labman
    If it ain't broke, don't fix it?
    Isn't that the truth.. learned that the hard way a few years back... cleaning all the grime and gunk out when doing some home plumbing... thought, "well while i have the drain unattached i might as well clean some of the other junctions that look gunky"... and of course the gunk was the thing keeping half of them from leaking in the first place.

    Honestly, I didn't even take my flame sensor out of the furnace. Shut power down, had reasonable access to reach in with a light sandpaper and just gave it a few strokes all around. Went from having the occasional "why is it so darn cold" in the mornings when the furnace was told to kick in to now having no problems so far... hoping that little productive minute spent cleaning it gets me through the winter.
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
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    #6

    Dec 4, 2007, 11:20 AM
    Quote Originally Posted by labman
    Hummmmmmmmmmm! A lot of that around. I have a 12 year old Bryant 80+. I wonder if I should go ahead and clean it before cold weather sets in, or leave well enough alone? If it ain't broke, don't fix it?
    You must have a flame sensor or you would not say anything about cleaning it but that age is about the time that flame sensors started to being used. I would like to know if you do have a flame sensor.
    Rodp's Avatar
    Rodp Posts: 1, Reputation: 1
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    #7

    Dec 29, 2009, 05:14 PM
    Well the flame sensor on my brynt furnace seems just about impossible to get to! I reached as far as I could and used a file and gut it working for now! Anyone have any suggestions on how to access the sensor better?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #8

    Dec 29, 2009, 05:24 PM

    What is the model # ? I'm thinking, 350, 352, or 355...
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