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Hi there. Usually when a pressure switch fails to open or close it usually means the combustion air blower is going slower than in normal operation. I would try to clean the fins of the blower itself. The pressure switch should be a black circle with clear tubes coming out it. Make sure the tubes are clear and not pinched.Try blowing threw each tube as well. Disconnect wires to pressure switch and then reconnect. the pressure switch is 24 volts so it is safe to work on while the power is on. Let me know how you make out.
Hi again. I forgot to tell you a few more things you can try. Blow into the tubes (clear or black) that go to the direction of the pressure switch. Sometimes this will open or close the switch. Disconnect the pipe that connects to the blower to make sure there is no blockage in the venting. Run just long enough to see if it works. If it does you know you have a blockage in the piping. Sorry I am rambling abit. Could be a lot of different things. Hope this helps..
Awesome. Good to hear.