I have a luxaire high efficiency furnace that is getting the error code for the pressure switch being stuck open. I took the rubber hose off to make sure it didn't have any holes and then used a paperclip to clean out the connection by the fan, but it is still flashing 3 after I reconnected the hose. Is there anything else that I can try to do to fix the situation because it is starting to get cold?

Remove the black plastic container which should have 4 hoses hooked to it and will be held in by two screws. If you will probably find water in it. Drain water, reinstall and this should fix your problem.