Furnace lights and goes out.

Old 09-29-18, 12:43 PM
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Furnace lights and goes out.

I am pretty stumped. I have a Trane XR95 furnace and I have been having issues with it the last two seasons. It will light for a second and go out. Sometimes it will stay lit and other times it will lock itself out. I have replaced the flame sensor, control board, high limit switch. I am completely stumped now and have no clue what to check next. All the wires look good and brand new Nest thermostat. Any help would be appreciated.
Old 09-30-18, 06:52 PM
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If it has a control board..... it will show ignition faults. Look thru the blower door to see it in operation and get the code it's flashing. The codes are listed on the back of the blower door.

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