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Is the 8 blink the first error you get or does it give a different code on first failure?
OK turn power off to furnace to reset.Call for heat.Watch for burners to ignite .Very first unsuccessful attempt we should get a different code.8 blinks means it has failed 5 times
8 RED FLASHES: This fault is indicated if the flame is lost 5 times (4
recycles) during the heating cycle
Yes try tapping gently on pressure switch and see if it will open.
Remove hose from vent motor, leave attached to switch.Suck and blow on hose and see if you hear it click
OK after sucking and blowing, reconnect and see if furnace will work, Should be unstuck now.