I have a Nordyne furnace, and the furnace got stuck in it's cycle. The vent blower would come on and that's it, so I had the circuit board replaced. Now, the a/c works but the furnace cycle won't even start. The light on the board just blinks twice. Any help would be great. Thanks.

I have a Nordyne furnace, and the furnace got stuck in it's cycle. The vent blower would come on and thats it, so I had the circuit board replaced. Now, the a/c works but the furnace cycle won't even start. The light on the board just blinks twice. Any help would be great. Thanks.
Is it a 90+ or 80+. What does it say for 2 blinks

The pressure switch is open. Mine was next to the vent pipe. (3/8" tubes running from vent to switch)