The F51 error code on a Whirlpool washer signals a Motor Position Sensor (RPS) failure. This happens when the control board cannot detect the rotation of the wash tub during a cycle. In most service calls, this is caused by a loose wire harness or a faulty sensor located at the bottom of the motor.
When I roll up to an F51 call, I already know what I'm going to find before I even touch the machine. Nine times out of ten it's a harness plug that's been rattled loose by a few thousand spin cycles. Ignore this one and you risk the control board trying to force power through a motor it can't track, which can fry components that cost way more than the original fix. Good news? Most of the time you're looking at a $50 fix, not a $500 one.
OK so here's the deal with F51. Your washer's main brain is trying to talk to the motor, but the position sensor isn't answering back. So the board does what any smart system does and shuts everything down rather than risk spinning a tub it can't track. I see this code constantly on the Cabrio-style top-loaders, especially ones that are 5 to 8 years old and have been running big loads. It looks scary. It usually isn't.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Loose or damaged wiring45%
Faulty RPS sensor board40%
Main control board glitch10%
Mechanical motor obstruction5%
Symptoms You May Notice
The machine starts sensing, you hear the tub give one or two little clicks trying to rotate, and then it stops dead and throws the code. Total cycle time before failure: maybe 10 seconds.
Motor hums like it's trying to engage but the tub doesn't spin. It's straining but going nowhere.
F51 pops up right at the very beginning of the cycle during load sensing, before it's even started adding water.
Machine fills up fine, drains fine, then dies completely when it tries to spin out the clothes.
Code comes and goes. Works fine for three loads, then fails on the fourth. Gets worse over time, especially with heavier or unbalanced loads.
Can you reset a Whirlpool washer to clear the F51 code?
After the repair, unplug the washer and leave it unplugged for a full two minutes, not 30 seconds. The control board needs that time to fully clear. Plug it back in, then run the calibration sequence: rotate the cycle knob left one click, right three clicks, left one click, right one click. The sensing light should start blinking. Press Start and let it run the short calibration spin. Don't load laundry yet. Let it finish the cal cycle first, then you're good to go.
Tools Required for Diagnosis
Phillips #2 screwdriverFlathead screwdriver7/16 inch socket and ratchet5/16 inch socketNut driver setDigital multimeterNeedle-nose pliersFlashlight or headlampElectronics cleaner sprayShop towelsAppliance dolly or a second person to help tilt the machine
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
ComponentComponent Under Test
Expected Range0–5 ohms
ConditionIf Open (OL) or infinite, replace component.
Frequently Asked Questions
Can I still use my washer with an F51 code?
Nope. The F51 is a hard stop. The board won't let the motor run because it can't safely monitor what the tub is doing, and without that feedback the motor can overheat fast. I've seen people unplug the machine, plug it back in, and squeeze in a cycle before the code comes back. That works maybe once or twice but you're gambling. If it fails mid-spin with a full load of soaking wet clothes in there, you've got a mess and a bigger repair bill than if you'd just fixed it the first time.
Is the F51 code the same as an RPS failure?
Pretty much, yeah. F51 is Whirlpool's way of flagging an RPS communication failure, but that doesn't mean the sensor itself is dead. It could be the sensor, the wiring to the sensor, or just an oxidized connector pin. The distinction matters because a $4 can of electronics cleaner and 20 minutes might fix what looks like a $65 sensor replacement. So F51 means 'the control board can't hear the RPS' not necessarily 'your RPS is physically blown.' Start with the connector before you order parts.
How much does it cost to fix an F51 error?
Totally depends on the root cause. Loose connector? Costs you nothing but an hour of your time. New RPS sensor? The part is usually $40-70, part number WPW10178988 on most Cabrio models, and it's about an hour of labor if you've never done it. If you call a tech expect $150-300 depending on your market and whether they've got the part on the truck. And if it turns out to be the main control board, that part alone runs $200-350. Which is why you always check the cheap stuff first.
Why does the F51 code happen more often on heavy loads?
Two reasons, both make sense. First, heavier loads create way more vibration during the spin cycle, and vibration is exactly what works those connector plugs loose over time. It's cumulative damage, every heavy load is one more shake on an already-borderline connection. Second, the motor works harder under a heavy load, and any sensor or wiring issue that's borderline will get exposed under stress. Think of it like a loose wheel on a car. You don't notice it at 30 mph, but at 70 it's terrifying. Same principle here.
Does F51 mean I need a new motor?
Almost never. In 15 years I think I've replaced two or three actual drive motors for an F51, and those machines had other obvious damage going on. The motor on these Cabrio-style washers is genuinely robust. What fails is the small sensor that reads it or the connector carrying the signal. Don't let anyone talk you into a motor replacement on the first visit without them checking the sensor and wiring first. If a tech jumps to motor replacement without doing that diagnostic work, get a second opinion before you spend that money.
How do I know if it's the control board causing the F51?
You figure it out by elimination. Check the connector first, test wiring continuity, inspect and replace the sensor if there's any doubt about it. If you put in a fresh RPS and you're still getting the F51, then you start looking at the board. The board is the last suspect because it's expensive and it rarely fails without showing other signs, like burn marks or a popped component you can see. If you skip straight to replacing the board, you're probably just throwing money at the wrong part.
Models Known to Experience F51 Errors
This repair applies to most Whirlpool washers with this error code. Common model numbers include: