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    kevinj1w's Avatar
    kevinj1w Posts: 6, Reputation: 1
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    #1

    Dec 21, 2008, 06:15 AM
    Gas furnace won't stay running!
    Hello, I have a Tempstar gas furnace model# NDN6050FBA1, It runs for 1-2 minutes then shuts off. I can hear the fan turn on, gas ignite, and then the blower motor. It doesn't run long enough to heat up and of coarse we are experiencing freezing temps. I wonder if my thermostat is going bad? Any suggestions would be greatly appreciated.

    Thanks, Kevin
    kevinj1w's Avatar
    kevinj1w Posts: 6, Reputation: 1
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    #2

    Dec 21, 2008, 06:26 AM

    Forgot to mention everything is clean, had the furnace serviced last spring.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #3

    Dec 21, 2008, 08:13 AM

    If you can see the burner area, how long is flame present before shutting down?
    kevinj1w's Avatar
    kevinj1w Posts: 6, Reputation: 1
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    #4

    Dec 21, 2008, 08:33 AM

    Its present for about 1 min or more but no more than 2 min.
    kevinj1w's Avatar
    kevinj1w Posts: 6, Reputation: 1
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    #5

    Dec 21, 2008, 08:48 AM
    I started messing with the thermostat to figure out which wire do what. Now the furnace is putting out some heat. Maybe my thermostat ( electronic Honeywell) is starting to go.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #6

    Dec 21, 2008, 09:40 AM

    Try this: turn off power to furnace, disconnect "R" and "W" wires from thermostat, and connect them together. Now power up furnace and see how it runs.
    kevinj1w's Avatar
    kevinj1w Posts: 6, Reputation: 1
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    #7

    Dec 21, 2008, 06:57 PM

    Thanks kc13, After my last post the furnace started to work and heated the house. If it happens again I will try this.
    Thanks again, Kevin
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
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    #8

    Dec 21, 2008, 07:21 PM
    Quote Originally Posted by kevinj1w View Post
    Forgot to mention everything is clean, had the furnace serviced last spring.
    I'm going to almost bet that your flame sensor is dirty and causing an intermittent problem. Just because it was cleaned last spring doesn't mean that they cleaned the FS. A spring inspection/cleaning is usually more targeted at A/C operation. I usually recommend a clean and check 2 times a year. Once in late spring for A/C season and then again in early fall for heat season.
    kevinj1w's Avatar
    kevinj1w Posts: 6, Reputation: 1
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    #9

    Dec 22, 2008, 08:06 AM

    Thanks Mark, as of know everything is working like it should and I'll take your advice and clean the flame sensor.
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