first I would check the door lock ... if it don't lock it will not spin ... frigidaire has some trouble with the door locks...if it locking and your lock light comes on.
check the door lock at the control J2 to J3 should have around 1500 Ohms. shorted or open is bad.
.. check for power to the motor there is a double plug you should have up to 300v there when it should go into spin or check motor winding on plug 5 pin 4 to5 should have 105 & 130 Ohms,...pressure switch controls the water level don't sound like your problem... Most the time I find that it is the door lock...