I have a Trane XR80 furnace and this afternoon it just started blowing cold air, so when I turn the heat up so it come on (when it kick on) all it does is blow cold air (no warmth at all).
The trouble code thing is blinking 4 blinks (light).
PLease help it is getting vary cold here in MN and I got a 3wk old baby!!
PLease any one know what it may be and how to check it or fix it?