Kenmore Washer Error Code F51

F51 indicates a Motor Rotor Position Sensor (RPS) failure or a problem with the lower wiring harness connected to it. The RPS monitors the motor rotor's position and speed, and the washer shuts down when the control board loses that signal. The fault can be in the sensor itself, the wiring harness, the connectors, or in rare cases the control board.

Resetting the washer may temporarily clear the F51 code, but if the underlying problem with the RPS or harness has not been corrected, the error will return once the washer attempts to run a cycle. A reset alone is not a fix and should only be used as part of the diagnostic process to confirm whether the fault is intermittent or persistent.

Repair costs vary depending on the root cause. A replacement lower harness or RPS sensor typically ranges from around $20 to $80 in parts. A main control board is considerably more expensive, often $100 to $250 or more for the part alone. Adding professional labor can bring the total repair cost to $150 to $400 depending on the specific fault and your location.

A knowledgeable DIYer can tackle this repair by working through the TEST #3 diagnostic procedure. This involves inspecting the lower harness for damage, checking connector integrity, and testing the RPS. If a damaged harness or faulty sensor is confirmed, replacing those parts is a manageable DIY job, though comfort with disassembling the washer cabinet and working around electrical connectors is necessary.

No, you should not continue running the washer while F51 is active. The code means the control board cannot monitor motor operation properly, which could result in the motor running incorrectly or mechanical components being damaged. Stop using the washer until the RPS circuit has been diagnosed and repaired.