Fault code 3F? Westinghouse smart drive LT819S

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The F3 is as follows,

F3= Motor Sensing Fault.

Either the motor is faulty, or the sensor attached to the middle of the motor is faulty.

You can check the windings on the motor for correct resistances at the wiring connections on the harness plug.

Pins 1/2 should be 32 OHMS,
Pins 2/3 should be 32 OHMS,
Pins 1/3 should be 42/44 OHMS,

Any other readings apart from that means the motor is stuffed.

To remove it, undo the motor wiring connecter, undo the 2 bolts (1 on either side) of the motor and lift the motor away from the base of the machine. Also, you may have to undo the motor sensor wiring connecter also*

If the readings check out, then you need to replace the motor sensor which is attached to the very middle of the motor, visible from underneath looking up at the motor.