Merry Christmas to you all!
I have a problem with my Trane XL-14 gaspack. The indoor variable speed fan does not work at all. It has suddenly failed. When I call for heat, the system fires up the gas heat, no air circulation but after a while it shuts down. The diagnostic light starts flashing four times: High Limit (TCO) Open.
I tried replacing the dual capacitor but it did not help. I removed the top of the gaspack and inspected the fan. It spins very freely but does not come on. I've inspected practically all electrical connections to insure a good connection.
I tried the air conditioner also to see if that would make the fan come on but it also does work in that mode.
I put the fan from auto to always on at the thermostat but it still does not come on. The fan light on the fan control circuit board lights up but does not operate.
Any suggestions? I am pretty handy and can perform electrical measurements but do not know where else to start.
Big Dog Daddy