View Full Version : Furnace won't kick on

Dec 12, 2006, 05:42 PM
My pilot light is lit on my furnace but the furnace won't kick on. I changed the thermostat and it did fire up but after running a short while it started to blow only cold air. Can anyone tell me what could possibly be wrong?

Dec 13, 2006, 05:46 AM
I would need a lot more information about what kind of furnace you have and if there is 24 volts at the red and the white thermostat wire in the furnace.