I have a TRANE XE 80. It will not complete ignition cycle.
I am getting 3 flashing lights indicating "Pressure Switch Stuck Open".
I have checked pressure switch with a meter and it tested ok. I tested it with furnace "on" and had 28 volts coming to the switch and traveling thru it to the inducer motor. As I removed the tube to the furnace, the switch would open and stop the 28 volts... reattach tube and switch would close and allow 28 volts to travel thru.
I followed the wire down to the inducer motor and it does get 28 volts. It is not hot. I am pretty sure I hear it running.
The pressure switch is definitely not stuck open, it is closed when "on".
Is this just simply a bad board, giving a bad *