I purchased the XL80 about 10 years ago and have now replaced the PCB twice. Both of the failed boards have the same burned area around a set of resistors. It appears that a circuit is overheating but takes several years to fail.
I have the 2 stage furnace. The concern that I have is that both boards have failed with exactly the same symptoms. And the replacement boards were probably recently made but I don't know for sure. I believe that there is a design problem but I could not get Trane customer support to verify this. /Daveb
Originally Posted by BaldLoonie
Some of the early (2000 ish) Intellignition boards did have problems, especially the single stage. Unusual to have 2 fail in 10 years but certainly can happen.