Gas supply shuts off early

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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?
 
Make sure the flame sensor is in the pilot light to recieve a signal that the pilot light is on.
 
amyjamie said:
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?[/QU

The flame rod in your pilot was not cleaned. these flame rods get a film build
up on them that you can't see. Take some emery cloth or fine sand paper
and clean the flame rod good and see if that works. Make sure the pilot flame touches the pilot head and goes around the flame rod. the flame completes the elect circuit so if the flame left off the pilot head it would break the circuit.
later Paul
Click to expand...
 
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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.
 
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.
 
Make sure flame sensor is also clean/polished with some sand paper until shiny chrome
 
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