Front loaders with microprocessor control have a built in diagnostic. When the control unit does not get a signal that the system is operating it shuts down and give a "communications" error. Unfortunately the error code does not give any hint of the problem, so you end up replacing components on spec.

If you are certain the wiring is not compromised then replacing the motor control unit is the next step, but this cannot be guaranteed to fix it.

Here is a service manual for your machine.

http://frigidaireservicetips.co...rizontalAxisWasherSM.pdf