Hi, my furnace will not light up. The pilot light is burning fine and the fan motor can be turned on manually from the button inside the furnace but when I turn the heat, ac or fan on from the thermostat it will not start at all... any of them. I replaced the Electric thermostat, the thermocouple and the filter in the furnace and still no luck on it starting from the thermostat panel. the only thing I can think now is wiring... any answers? its friggen cold in here tonight! lol

Did you check voltage at the stat? Could be a control panel fuse, a fuse on the 24 volt transformer or a bad gas valve. I'd look for a fuse

Thank you I will try that!