This is a great video, been playing with this problem for a year. I have been resetting our Trane X90 by removing power for a few minutes. Then the furnace will spark up an run enough to maintain a temp. You could get it to go up one degree, never more than one degree. Fortunately my tenant works for a HVAC company and has access to Trane Parts and (advice). So I’m gonna make sure the parts match up and I’ll have my HVAC friend/tenant earn some extra bucks and replace the part. Thanks again for the video.