Whirlpool Washer Error Code F51

F 51 indicates a Motor Rotor Position Sensor (RPS) failure or a problem with the lower wiring harness connected to that sensor. The RPS monitors motor rotation speed and position, and the control board uses this data to manage the wash and spin cycles. When the signal is lost or out of range, the washer halts the cycle and displays F 51. Diagnosis should begin with the motor circuit test procedure to isolate the faulty component.

You should not continue running the washer while F 51 is active. The code means the control board cannot properly monitor motor rotation, which removes a key safeguard against motor over-speed or overload conditions. Running the machine in this state risks additional damage to the motor or control board.

Performing a reset by unplugging the washer for a few minutes may temporarily clear the F 51 code, but the fault will return if the underlying cause is not repaired. The RPS sensor or wiring harness problem that triggered the code will still be present, and the error will reappear during the next wash cycle. A proper repair of the sensor or harness is necessary to permanently resolve the issue.

A knowledgeable DIYer can address this fault by inspecting the lower wiring harness for damage, checking that all connectors are fully seated, and cleaning any corroded terminals. If the harness is intact and connections are solid, replacing the RPS sensor is a straightforward repair on most Whirlpool front-load and top-load platforms. However, if the motor or control board is involved, professional service is recommended.

If only the RPS sensor needs replacement, parts typically cost between $15 and $50 depending on the specific model, making it one of the more affordable washer repairs. If the lower wiring harness requires replacement, parts are generally in the $20 to $60 range. Professional labor will add to these costs, and a control board replacement, if needed, can bring the total significantly higher, often in the $150 to $350 range for parts and labor combined.