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BTW, Thank KOK328.

I found a new ignitor and put it in. No change to the situation. I am going to try replacing the flame sensor and the limit switch on the draft inducer fan to see if that is the issue. I pulled the fan last evening and it would run when outside the housing, but with any back pressure (even...

Sounds like a good plan. Problem is Trane does not provide a ton of detail on voltages, resistance or anything else for that matter, including a parts list. At least for a car you can get a detailed manual.

Folks, My unit is an XE90 model tux080c942c3, serial z2833rt7g. I have had annual issues with this baby, but this year, it is not cooperating. When switched on, the exhaust fan starts up and the ignitor (new) starts to heat (I know this cause I burnt my finger on it), but before it can get to...