My furance will come on, but won't blow air in auto. It will blow in ac and "on" (heat or cool) mode. What should I check?
JonesHVAC
Oct 19, 2011, 05:46 PM
I would remove the thermostat and then jumper the red and white wires. That will call for heat as if the stat did it. I am willing to bet that you have a bad stat.