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Take the rubber tube off the pressure switch and inducer motor port, check the tube and make sure it is clean and the port is clean. If so tap on the pressure switch and then try it again. If it happens again replace the pressure switch.
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OK remove one of the wires to the pressure switch and see if the unit will then start up. If so the pressure switch contacts are stuck closed and you would need to get a new one.
OK sounds good if you removed a wire and the unit did not even try to start up and it is still displaying that code, then the board may be bad.
No you can ask for a refund