Well. It dropped down to about -30 today so ofcourse it would be a fantastic time for the furnace to not work. I have a G4OUH Lennox Furance. The furnace was working fine yesterday but for whatever reason its not today. When the T-Stat calls for heat. The Blower starts. And when the igniter goes to fire up it will only burn for 10-20 seconds if I am lucky.
On the Control panel there is 2 LED lights Alternating. It seems to be in watchguard mode. Me being a sparky I only really troubleshooted the electrical. And that all seems to be in good working order.