Had a Trane XL90 two-stage high efficiency gas furnace installed in 02'. Open limit switch diagnostic L.E.D. came on last night and the electrical schematic is completely corroded need help finding the switches. Thermostat said 43 this morning.

I have a Trane XR90 that was showing a solid diagnostic light. Could wiggle the wires and the furnace would work for a few hours. Solid light wiggle the wires and board = heat. Finally wiggling wouldn't work. So I replaced the IFC board. Went to turn every thing on and now 4 blinks on the...

Thanks for your input. I finally was able to reverse the wiring and got it squared away. While I was in the attic I thought I would replace the motor which drives the fly wheel. I thought I was a hero till I put everything together and discover 4 flashing lights. The lights indicate "open high...

I hava a Trane XL90 furnace that was installed new about 3 years ago (oct 2006). Yesterday it stopped heating; and only blows unheated air out the registers. The Control board Red LED flashes a code 5. The Green LED is flashing slowly. The local HVAC company looked at it and concluded that...

Furnace is about 13 years old... we just replaced the ignighter in it last night because it was running through all the steps to run except ignighting. It fired right up and ran for about 7-8 hours... now it won't ignite at all (it is running through all the steps it needs to except for...