Whirlpool Cabrio Washer F51 Error: Motor Position Sensor Fix

Quick Answer

An F51 code means the Rotor Position Sensor (RPS) is failing to communicate with the main control board. Check for loose wiring at the bottom of the tub or replace the RPS sensor located on the stator assembly to restore motor function.

Seeing F51 on your Cabrio usually means the washer's gone blind. That little sensor tucked under the tub tells the board exactly how fast the motor's spinning, and without that signal the machine shuts down to protect the drive components. It's honestly a really common issue on these models after a few years of hard use. Usually it's just the sensor or a loose wire, not the expensive stuff.

WhirlpoolWasherSeverity: highDifficulty: intermediate88% DIY Success

Time to Fix

45–90 min

Difficulty

intermediate

Parts Cost

$25 – $75

Tools Needed

1/4 inch nut driver, 7/16 inch socket and ratchet

What Does the F51 Code Mean?

OK so here's the deal with F51. It's basically a communication breakdown between the motor and the brain of the machine. The control board's trying to drive the motor but it's not getting any feedback from the sensor, so it can't safely run the spin or agitate cycles and it just stops everything. Good news is it's usually a $25-35 sensor fix, not a new washer situation. I replace these things pretty regularly.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

RPS Sensor Failure65%

Wiring Harness Issues20%

Loose Rotor or Mechanical Obstruction10%

Control Board Fault5%

Symptoms You May Notice

F51 pops up on the display right when the basket should be ramping up to spin speed, usually about 4-6 minutes into a cycle.
You can hear the motor humming and trying to engage but the basket just sits there, not moving.
The basket jerks two or three times like it's trying to start, then just gives up and throws the code.
Machine drains completely fine but won't kick off the next phase of the wash cycle.
Spin cycle starts at low speed but dies when it tries to shift into high-speed extraction.

Can you reset a Whirlpool washer to clear the F51 code?

Hit the Power/Cancel button twice to clear the active code. Then unplug the washer from the wall for a full 5 minutes, not just 30 seconds. The board needs time to fully flush its memory. Plug it back in and run either the Clean Washer cycle or a small normal load to confirm the motor and sensor are talking to each other correctly. If F51 doesn't come back, you're all set.

Tools Required for Diagnosis

1/4 inch nut driver7/16 inch socket and ratchet10mm socket and ratchetPhillips #2 screwdriverMultimeterFlashlightRubbing alcohol and old toothbrush

Service / Diagnostic Mode

With the washer in standby, rotate the cycle selector knob 360 degrees. Perform the sequence: Right, Left, Left, Left, Right. All lights should flash. Turn the knob until Spin is lit and press Start to see saved codes.

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

ComponentComponent Under Test

Expected Range5–12 VDC

ConditionIf Open (OL) or infinite, replace component.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Rotor Position Sensor (RPS)W10183157 · $25–$45	W10183157	$25 – $45
Lower Wiring HarnessW10116735 · $40–$75	W10116735	$40 – $75

Frequently Asked Questions

Can I bypass the RPS sensor to get the washer running?

No, you can't bypass it and there's really no point trying. The RPS uses Hall Effect sensors to tell the control board exactly where the motor's rotor is at all times, and without that timing data the board can't fire the right stator windings in the right sequence. The motor just won't turn. It's like trying to drive with your eyes shut. You need to replace the sensor if it's bad, there's no workaround on these machines.

Why does my washer only show F51 during the spin cycle?

That's really common actually. Low-speed agitation doesn't demand much from the sensor, so a barely-functional one might limp along fine during washing. But spin cycle requires precise high-speed motor control, and at those RPMs any loose connection or weak sensor signal gets amplified into a full failure. If it's only dying at high speed, check the rotor bolt first. A loose rotor wobbles at high RPM and can throw off even a perfectly good sensor.

Is F51 the same as the F50 error code?

They're closely related but they're different faults. F50 means the motor's stalled and can't move at all, like something's physically blocking it or the motor itself is dead. F51 specifically means the sensor circuit's failing. The motor might actually be fine but the board can't tell what it's doing. In practice we check them the same way: obstructions first, then sensor, then wiring, then board. If you're seeing F51, there's at least some signal getting through.

How do I know if the problem is the board or the sensor?

It's almost always the sensor or the wiring, honestly. I'd say 90% of the time. I've replaced dozens of RPS sensors for F51 over the years and only had to swap the actual control board maybe twice. The way to know for sure: if you've confirmed the board is sending the correct voltage to the sensor but you're getting no signal back when the tub turns, the board's fine and the sensor's dead. Order the sensor first.

How long does the RPS sensor replacement actually take?

It's one of the easier jobs on a Cabrio, honestly. Figure 45 minutes to an hour if you haven't done it before. Most of that time is just tipping the machine back and getting comfortable working underneath it. The actual sensor swap once the rotor's off is maybe 5 minutes. Don't rush the wiring inspection though, that's where you can miss something subtle. Total parts cost is usually under $40 with shipping.

Related Whirlpool Washer Error Codes

Code: F50Whirlpool Washer F50 Error Code Code: F52Whirlpool Washer F52 Error Code

Models Known to Experience F51 Errors

This repair applies to most Whirlpool washers with this error code. Common model numbers include:

WTW6400SW0, WTW6600SW2, WTW6200VW1, MVWB750WQ0, MVWB800VQ0, WTW6700TU1, WTW6300SW0

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 17, 2026