Originally Posted by BINDER
Just purchased a new circut board for my suburban furnace model nt30m and furnace worked fine on bench. Installed in my AS and it started and hooked all wires and fan came on but would not light.If I crossed thermostate wires at furnace it starts every time and cuts off when limit switch activates.I cross wires at thermostate and furnace fan runs but will not light.Any help would be great.
I'm not sure I understand this. If you short the thermostat wires at the heater, it lights and runs until it trips the overheat switch?
Hmm.... If it has enough airflow out, why would it trip?
Also, do you have a separate thermostat for the heater and A/C?