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the small rubber tube from the pressure switch attaches to a barbed fitting on furnace...have you poked this fitting out all the way through?
remove 2 wires fro pressure switch...start furnace..wait until AFTER the exhaust fan starts...then hold the 2 wires together metal to metal...tell me if it still faults
Do the bypass just for testing. Do not leave bypassed as it will fault on next start up.
are you sure this is not code 13?
short blinks first followed by long?
ok just making sure...
ok this means board is ok and the issue is with the air flow....have you looked inside the exhaust blower yet?
either remove vent pipe or remove the inducer motor from the furnace wall...we nee to see if feathers, missing blower fins etc..
any chance of downdrafts or severe wind?
ok, we have fan working and fittings clear, tube ok, vent clear...either the bypass we did was not at a fault time. (pressure switch) we could simply have a weak pressure switch.
yes...that would be the next step.