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Does the little vent motor come on or is that where the buzzing is coming from?
The 31 error code means pressure switch did not close.That little motor has to run to pull a vacuum on the pressure switch to close it.
Ok are you saying it does not spin freely?And do you have a volt meter for checking voltage?
If I were there, first thing I would do is verify we are getting 120v to motor, but the fact that it does try and does not spin easily implies that either the motor is bad or it is binding. You could remove the small ven tmotor and verify little blower wheel is not broken or a small bird or something inside.
I am showing part number 318984-753.Look on old motor to verify. If so you can order online for 60 bucks.
That number is ***** up the wheel.Do you see a number on motor itself?
That one is even cheaper
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Let me know if I can assist further.