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

I have not previously seen this abnormal sequence - I can't figure out why it doesn't do the normal 30 second draft blower before igniter before gas valve sequence - any advice? This is what it is doing: [list=1] [*]Thermostat sends heat signal [*]Draft blower starts [*]10 seconds later the gas valve opens releasing raw gas up the flue [*]four or five seconds later the hot surface igniter starts to glow [*]two or three seconds later the gas valve and the igniter shut down before the igniter gets hot enough to ignite the flame [*]seven or eight seconds later the draft blower shuts down [*]A few seconds later the draft blower starts back up before it has time to spin all the way to stop, and then the furnace starts and completely cycles with a normal sequence. [/list] Ralph