Not sure if this will still apply to anyone, but I've just completed a patch on the Trane XE70 furnace. I'd been having intermittent problems described in the previous threads:

https://www.doityourself.com/forum/g...not-light.html

Trane XE70 furnace doesn't light.

Trane XE70 Flame Sensor Removal/Cleaning/Replacement

Basically, the igniter ticks, about once per second, repetitively, with no action. In the past, I had discovered that wiggling the 5-pin connector on top of the gas valve would open the valve and get my furnace working. I have tried recrimping the three black wires with no success. Removed the female connector and cleaning the pins and slots with no success. Cleaned the igniter and flame sensor, no success. Finally caught on to this forum, and saw that others had isolated the problem to the actual internal connections of the pins (I think thats right). Parts are hard to come by, it seems, so I wanted to leave my solution to help others trying to keep their 30+ year old unit running!

Nothing fancy, but as other members had mentioned, a screw driver forcing the 5-pin a certain direction kept the fire burning. I used an old prong for a wall outlet from a lamp plug I had disassembled and replaced awhile back. It slides nicely next to the ends of the 5-pin connector. For me, placing it on the left hand side of the connector, while looking at the furnace has resulted in regular and predictable furnace function. Use your best judgement... turn off the power and gas while you're working and all that.

Hope that helps someone. I was thrilled to find others with the same issue I was dealing with for years.

 

Welcome to the forums.

Not sure I'd call that a patch. More like a work around.