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What is model on the furnace?
Yes.Was looking at manual. The E1 error is telling us the pressure switch is sticking closed,(not opening at end of cycle)If all wiring is intact, you will need to replace the switch.
My bad. I mis read, The E2 is just the opposite.Switch is NOt closing.
Most common causes are blocked or pinched hoses , blocked vent or blocked drain.
I would start by removing hoses and making sure they are clear.Look for any signs of debris in fittings where hoses connect. Them make sure main drain is clear and no kinks or any standing water in the rubber drain hoses.
I seen as small a thing as a spider web or dirt dauber in vent cause this.have you thoroughly examined vents?
These are the most common causes,If all check good, I think my next step would be to obtain a vacuum gauge that reads vacuum in inches of water column and check the pressure to each switch to see if it is in parameters as stated on each switch.If we can prove vacuum is correct, replace switch