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Trane XB80 Furnace Ignition timing not working.


Premium Member
Jan 13, 2021
Model Number
-major brand-
More than 10 years
I have a Trane XB80 furnace that is roughly 20 years old.

The Hot Surface Igniter is not getting up to temperature to ignite.
It shuts off, turns back on...
And then proceeds to the second cycle, still doesn't... and so on and so forth until it just times out and stops permanently and blows cold air.

Normally it would start heating up earlier to account for the temperature and then ignite the gas; however it does not.
It will repeat until it flashes 9 times. (Which seems to be my igniter circuit)

I've been getting around this by unplugging my unit when it doesn't ignite the first time. by doing this it will ignite the second time, guaranteed.

I followed the Igniter line to the board and cleaned the connections, to make sure it was getting a solid connection. it didn't seem to do the trick. I also checked the volts and it was around 60. So I was thinking that it doesn't have enough voltage to get up to temp? Would this be fixed by getting a different igniter? how can I find out if this is a board issue? I would obviously like to try other things before I drop a couple hundred dollars on a new board.

Any ideas?
It shuts off, turns back on...checked the volts and it was around 60.
I wouldn't think 60 VAC is enough to turn it on. I don't have any experience on that model but I would say the problem is the board. I looked online for the service manual and several sites have the manual for download if you register for a free account and others want $. Malwarebytes blocked two sites for riskware. If you want to download the service manual or if you already have the service manual and can post it here, I'll be able to tell you igniter or board.

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