last week our house was cold and I noticed that the system was not running. I checked the thermostat. It was set on heat, fan 'on' and the normal/emerg switch was set to normal (always has been). I didn't find anything obvious, so I hit the breakers and it came on and all was good. Tonight however, it seemed hot in the house and sure enough, the thermostat was set on 70 degrees, it was nearly 80 (checked on the thermostat and 2 other places in the house) and still blowing hot air. I've done all I know. I played with the light switch on the inside unit (fan cutout, I guess). THe outside unit keeps running. I've flipped all the breakers, played with the setting on the thermostat and even flipped the normal/emerg switch to 'emerg', but the outside unit keeps running. It keeps running even when the fan stopped engaging. I finally pulled the big fuse on the outside wall, by the outside unit.
Any thoughts (besides calling the local Trane service rep in the morning)?
thanks
PS: changed the filter about 2 weeks ago.