I have a 2007 Trane XB furnace, when I tried to install a new Thermostat, nothing worked, so I installed the old thermostat to fix the problem but the furnace is still not kicking on, when It worked fine before. Is there some type of reset switch I need to trip? I thought possibly I blew a Fuse, but I can not find a fuse anywhere on the system. I have voltage to the wires going out from the circuit board to the Thermostat. Any ideas on what I should check next would be greatly appreciated.