I have a York Diamond 80, model p2mpd furnace, about 11 yrs old. It ran well all winter until I noticed a gas leak in gas pipe leading to furnace. Gas was shut off, valve replaced, secure leak. Furnace started all right after this chore. It worked well for about 2 days, then the flue blower would come on, you could hear a click when gas valve was to open and it did not, also ignite item does not glow like it should and allow the gas valve to feed burners. I have checked all that I could think of, even replaced gasket on vent chamber to make sure there was no air leak, code is either 3 flashes or 1 at different time. I would check high limit switch if I knew where it is located, I don't have manual or schematic to check.. Also I have read that there is possible a "reset" switch that can be reset, where is it? Thanks...

Mine is 10 years old and the motor is making all kinds of noise. the bearings must be ready to let go. It's the trane xl90. I'm not happy. I'd like to replace the 5sme44jg2002e CCW with an upgraded unit if possible. If anyone is selling the upgrade, please let me know.