Gas supply shuts off early

Discussion in 'HVAC' started by amyjamie, Oct 15, 2010.

  1. Oct 15, 2010 #1

    amyjamie

    amyjamie

    amyjamie

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    I have a Trane XL 80 furnace that was cleaned last week. On turn on today, the gas supply shuts off about 4 seconds after ignition. I bypassd the thremal limit swtich and get the same result. Any suggestionms?
     
  2. Oct 15, 2010 #2

    kok328

    kok328

    kok328

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    Make sure the flame sensor is in the pilot light to recieve a signal that the pilot light is on.
     
  3. Oct 16, 2010 #3

    paul52446m

    paul52446m

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    Last edited: Oct 16, 2010
  4. Dec 18, 2012 #4

    mjocius

    mjocius

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    I am having a similar issue. My Xenon furnace is 10 years old. We had someone come out and clean/tune it up this year and he 'discovered' that our two stage furnace was running in one stage, so he supposedly set it back to two stage. Since then, our furnace is having startup issues. Blower will start. I will then hear the flames kick in, but it doesn't sound very strong. After about 10 seconds, the flames go out. Blower will continue to blow and the cycle repeats until it eventually starts correctly or shuts down completely. Second repairman and company have replaced circuit board, pressure switch and thermostat. Still same problem. Any ideas? Guy coming back out to the house on Friday and I'm NOT paying for anymore repairs! Furnace is still set to run in two stages.
     
  5. Dec 18, 2012 #5

    tinmantu

    tinmantu

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    Depending on the year of the trane xl, the older models had two screw holes on the flame sensor. I remember one of my first times servicing one that I got it in the wrong hole and it was a good lesson....not saying that's your problem, but the flame should be covering it completely, not partially.
     
  6. Dec 21, 2012 #6

    joechuckg

    joechuckg

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    Make sure flame sensor is also clean/polished with some sand paper until shiny chrome
     

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