The F51 error is a RPS (rotary position sensor) board failure where the control board looses contact with the RPS during the machines operation. The RPS uses hall effect sensors to determine the speed and direction of the drive motor, allowing the control board to constantly monitor the motors operation. Because this error is a communication error and not a mechanical error with the motor itself (that would be and F52 error) we can limit our trouble shooting to the three items that make up the RPS circuit, the control board, the wiring harness, and the RPS itself.
The F51 fault code on your Cabrio washer indicates that the control board is not sensing the proper drive motor spin. To clear the fault code, press the Pause/Cancel button.
Make sure that the drain hose is not stuck way down the stand pipe. This can cause siphoning of fill water which will inhibit proper motor rotation.
Check to see if the wash basket spins freely. If it does not, you may have an item of clothing stuck between the outer tub and the inner basket. This restriction in rotation will also cause an F51 fault code.
If these tips do not help you resolve the F51 problem, then you probably have a component failure. Possible failures include: wire harness or wire connection problem between the machine control and the RPS sensor (Rotor Position Sensor), a failed RPS sensor, a failed drive motor, and a failed machine control board.
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