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What is the model on the furnace.Look just above burners on right inside panel. Will be smething like 58GSC08 or similar so I know which furnace you have in the 8000 series.
Excellent. The 31 error code is indicating that pressure switch is not closing or is opening back up. When you call for heat at thermostat, does the inducer motor(small vent motor) come on?
Your furnace has 2 motors.ONe small one where vent leaves furnace and then a large blower in bottom of unit that circulates air in the home. I am referring to the small vent motor: