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Old 10-25-2011, 08:53 PM   #1
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My Trane Igniter Burnsout


My XR80 Trane TDD060C924F0 is on its second igniter this year. The igniter lights up quickly and glows brightly, lighting the gas. Is it supposed to shut
off after ignition or does it glow all the time? I waited 5 minutes and my igniter was still shining. Looking for theory of operation here. Any help appreciated greatly.

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Old 10-26-2011, 04:21 AM   #2
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My Trane Igniter Burnsout


Should shut off a second or 2 after the flame is established.

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Old 11-06-2011, 11:01 PM   #3
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My Trane Igniter Burnsout


Have been busy or I would have replied sooner. Do you think it is in the card or the flame sensor. I suppose I could check by replacement of flame detector, it being cheaper than the furnace control card.
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Old 11-07-2011, 03:58 AM   #4
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My Trane Igniter Burnsout


Its not the flame sensor.

Could be the board.
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Old 11-07-2011, 10:25 PM   #5
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My Trane Igniter Burnsout


Am leaning toward the IFC after playing with it today, and finally finding some theory of operation and schematic from American Standard Inc. The only device in the logic that controls the igniter is the board itself. Flame detector is good, ground and polarity good, I found that I could induce a high limit fault by flexing the IFC. Checking the continuity across pins 1 and 7 of the 12 pin connector showed no devices open in the temp limit loop. Flexing just so, and fault goes away! However, once the burners start, the igniter is glowing happily also. Ordering new IFC tomorrow. Will get the White Rodgers 50a65-843 Universal as it has a plastic cover that prevents flexing.

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Old 12-01-2011, 08:06 PM   #6
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My Trane Igniter Burnsout


Turned out to be the board! Examination of the defective board showed heat marks in the resistor array that controls ignitor output voltage I am guessing. The board was not learning anymore and just pumping lots of watts to the ignitor, which was not shutting off on top of it! New universal replacement from Rodgers White fixed the problem. Also a new SiNi ignitor. Happy Trane now.

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