Greetings all, We've got an American Standard Freedom 90 gas furnace (installed in 1996!).. Heat works but after reaching temp the blower stays on for a long time (maybe 30-60+ minutes). I know the "On delay" is adjustable for up to 180 seconds. I cleaned the flame sensor. I pulled a wire on the furnace temp sensor switch but the blower stayed on (not sure if it's a NO or NC circuit though). Filter was recently replaced. Also, I've recently replaced the thermostat (though that had no effect on the problem). Thoughts, advice??

Hello, After lots of research, I bought a Trane's part # CNT5159 to replace the existing board on my Trane XV95 furnace. How do I know that the board was bad? Well, I have 2 XV95's, which had the same problem of randomly kicking in upon heat calls. A service company came and fixed 1 of the furnaces by replacing the board for $1200. I watched the whole thing and thought that I could do it myself. So, I ordered the board for $400 and ....ran into a problem in which the new board does not have the CIR-H connector installed (see second picture (new board), middle of third row from top or first picture (old board), third cable connector from left). Could someone advise what I should do now? Return the board and pay another $1200 to the serviceman? Skip the CIR-H connector altogether? Plug the cable that was connected to the CIR-H to a different connector? Thank you much in advance for your time and expertise. I appreciate any help that I could get. Phongski