LG Washer Not Sensing the Load After a Rotor Position Sensor Replacement

I Changed the Rotor Position Sensor on My LG Washer and Now the Load Sensor Doesn’t Work

Let me save you a lot of time right at the top: your LG washer does not have a load sensor. There is no separate part with that name hiding somewhere behind the tub. On an LG direct drive machine, load sensing is a job the rotor position sensor does. That’s the same hall sensor you just took off and put back on. So when you tell me “I replaced the hall sensor and now the load sensing doesn’t work,” what you’re actually describing is one fault, not two. The sensor you just installed is not reporting rotor position correctly.

Here’s how the machine figures out load size. During the sensing phase, the control board gives the motor a series of small nudges — short rotations, one direction then the other. It watches how fast the rotor accelerates, how far it coasts when the power cuts out, and how much torque it took to get moving. Inertia is the measurement. A drum with eight pounds of towels in it behaves differently from an empty one, and the only way the board can see that behavior is through the hall sensor. Blind the sensor and the board is trying to weigh the load in the dark. It fills wrong, tumbles oddly, hangs at the beginning of the cycle, or throws a fault and quits. That’s not a coincidence with your repair. That is your repair.

Good news is that narrows the search a lot. Let’s go through it in the order it actually turns out to be.

1. The Connector Isn’t Fully Seated

This is the most common ending to any sensor swap on any appliance, and the hall sensor connector on these LG machines is a particularly easy one to get wrong. It’ll go on crooked. It’ll go on one click short of latched. It looks connected — it’s sitting there on the sensor, it doesn’t fall off when you touch it — and it’s not making contact on all pins.

Unplug the machine, get the panel back off, and pull that connector all the way off. Don’t wiggle it and call it good. Off. Then look at the pins on both halves under decent light. You’re looking for a terminal that has backed out of the plastic housing, a pin bent sideways, or a pin pushed flat. If a terminal backed out, the connector will feel like it seats and one circuit will simply be dead. Push it back in until it locks, then reconnect and listen for the click.

While you’re in there, follow the harness. It’s very easy to pinch the wiring under the rear panel edge or trap it under the sensor bracket when you’re buttoning things back up. A pinched wire that’s only partly cut through will work at rest and go intermittent the second the drum moves — which is exactly during the sensing phase.

2. The Wrong Sensor for Your Machine

LG has used several hall sensor variants across their direct drive line, and here’s the trap: they physically fit each other. A sensor that bolts straight on, lines up with the screw holes, and plugs into your connector can still have a different pin order or a different arrangement of hall elements inside. The board reads what comes back and it’s garbage. Motor turns, machine can’t measure it.

Dig the old sensor out of the trash if you can and set the two side by side. Compare the body shape, the number of pins, the wire colors going into the connector, and the position of the sensing face. If anything is different, that’s your answer.

Then check how you ordered it. You need the full model number including the suffix from the sticker on the machine, not the model you see printed on the front. On front loaders that sticker is usually inside the door opening on the frame. On top loaders it’s under the lid or on the rear panel. Punch that whole string into a parts lookup and see whether the part you installed is actually listed as a match.

I’ll be blunt about aftermarket sensors: they’re a recurring source of this exact complaint. Some of them are fine. Some of them are the wrong internal layout in a housing that fits. If you bought a cheap one from a marketplace listing that says it fits forty model numbers, it belongs high on your suspect list.

3. Wrong Orientation or Wrong Air Gap

The hall sensor has to sit a specific distance from the rotor magnets. Too far away and it reads weakly or drops out intermittently. It’s not a wide window.

Three ways people get this wrong on reassembly:

• The bracket goes back on reversed or rotated, so the sensing face isn’t pointed where it was.
• A spacer or shoulder washer gets left out — they’re small, they’re dark grey, and they land in the carpet.
• The mounting screws weren’t brought down evenly, so the sensor sits cocked and one end is further from the magnets than the other.

The symptom fits your complaint precisely: the motor turns, but the board never gets a clean enough position signal to measure the coast, so the sensing phase never completes. Take the sensor back off, compare it to how the old one sat, and snug the screws down in stages, alternating, until they’re even.

If you want a refresher on how it should have gone together, I walked through the whole job in the rotor position sensor replacement walkthrough.

4. Rotor Bolt Torque and Damaged Magnets

This one bites people constantly. If you pulled the rotor to do the job and didn’t retorque the center bolt properly on the way back, the rotor can shift on the shaft. At rest everything looks fine. Under the loading of the sensing spin, the gap between magnets and sensor changes and the signal goes to pieces.

Get the actual torque figure for your model — don’t guess and don’t go by feel, and I’m not going to make a number up for you here. It’ll be on the tech sheet or in the model-specific service information.

While the rotor is in your hands, look hard at the magnet ring on the inside face. You’re looking for a cracked magnet or one that has separated from the ring even slightly. A rotor with a loose magnet reads perfectly well sitting still and falls apart during the sensing spin, because the spacing between magnets is no longer even. This is easy to miss because nothing rattles and nothing looks broken until you run a finger around the ring and feel a lip.

5. Stator Damage from the Repair Itself

Getting an LG rotor off frequently means a puller, and pullers do not care what’s behind them. It’s very easy to:

• Nick or crush a section of stator winding with the puller legs or a slipped tool
• Knock the stator’s own connector partway off while you’re working around it
• Drag the rotor across the stator face on the way out and score it

A stator with a partially damaged winding gives you a motor that still turns — sometimes quite convincingly — but doesn’t turn smoothly enough for the board to measure inertia against. Torque delivery gets lumpy, the coast is unpredictable, and the sensing math comes out nonsense.

Look over the whole face of the stator with a light. Any winding that’s shiny where the varnish rubbed off, any flattened section, any copper showing. And check that stator connector is fully home while you’re at it, since it’s right there.

6. The Original Fault Was Never the Sensor

A lot of people replace the rotor position sensor as a guess after an LE error, because that’s what the internet said. If the real fault was mechanical, the sensor swap changed nothing and the load-sensing complaint you’re seeing now was already there — you just didn’t have a name for it before.

Here’s the two-minute check. Unplug the machine. Reach in and spin the drum by hand. What you want is a drum that turns freely with light pressure and keeps coasting for a bit when you let go. What you don’t want:

• Grinding or gravelly noise as it turns
• Roughness — tight spots at certain points in the rotation
• A drum that stops dead the instant you stop pushing

Any of those points at bearings or something binding, not electronics. A drum that won’t coast can’t be weighed, because coasting is literally the measurement. No hall sensor on earth fixes that.

On front loaders there’s a related failure worth knowing about, where the drum spider corrodes and throws off the whole assembly — I covered how that ties into LE error and hall sensor problems on LG front loaders.

Testing the Sensor You Just Installed

Unplug the machine first. Every time, before the panel comes off, before the meter comes out.

With the sensor connector unplugged, put a multimeter on resistance and check across the hall element circuits at the sensor side. There are three of them. What you’re doing is comparing them to each other. They should come out broadly consistent — same ballpark, no outliers. If one circuit reads wildly different from the other two, or reads open / OL, that sensor is bad. Brand new in the box is not a defense; I’ve seen plenty of aftermarket hall sensors fail this test straight out of the packaging, and honestly that possibility belongs near the top of your list, not the bottom.

For the actual expected values, get them off the tech sheet for your machine rather than from me or from a forum post. On most LG washers the tech sheet lives in a plastic sleeve inside the lower kick panel, or taped inside the rear panel. That sheet is model-specific and it’s right. Anything I told you here would be a guess across a dozen different variants, and a guess is worse than nothing when you’re deciding whether to buy another part.

Watch the sensing phase itself

Run a cycle with the drum completely empty and stand there for it. You’re watching for whether the machine does its little back-and-forth nudges and then moves on, or whether it nudges, pauses, nudges again, and keeps repeating or hangs. A machine that never gets past that stage is telling you the board isn’t getting a usable answer.

LG also builds in Smart Diagnosis, which transmits fault data through your phone to LG support. If you’ve got the app or you’re willing to sit on the phone with them, it’s a free second opinion on what the board thinks is wrong, and it costs you nothing but time.

Reassembly Checklist

Run this list every time before the panel goes back on. Most of the failures I see from friends after a hall sensor job come down to one line on it.

1. Hall sensor connector fully seated and latched — you heard the click, and you pulled on it to confirm.
2. Harness routed clear of panel edges and brackets, nothing pinched or stretched.
3. Sensor bracket in its original orientation, with every spacer and washer that came off it back on.
4. Rotor bolt torqued to the spec on the tech sheet, not to feel.
5. No debris, no dropped screw, no shop rag between rotor and stator.
6. Stator connector seated.
7. Ground wire reattached to its original point and tight.

When the Answer Is the Main Control Board

I’ll be straight with you about this one because it’s where the money is.

If you have confirmed the sensor is the correct part for your full model number, it tests consistent across all three circuits, it’s correctly seated and correctly gapped, the harness is clean, the rotor bolt is torqued, the magnets are intact, and the drum spins freely and coasts by hand — and the machine still cannot complete the sensing phase — then the main control board is what’s left. The board is the thing doing the math. If it isn’t interpreting good data correctly, no amount of good data helps.

That’s the expensive answer. Before you order one, price the board for your specific model and hold that number up against what the washer is worth and how old it is. On a machine that’s a few years old with everything else working, a board can make sense. On an older machine that’s also been quiet about a bearing noise you’ve been ignoring, it often doesn’t. There’s no shame in deciding it’s not worth it — I’ve told plenty of neighbours the same thing standing in their laundry room.

Frequently Asked Questions

Does an LG washer have a separate load sensor?

No. There is no dedicated load-sensing part on an LG direct drive washer. The rotor position sensor does that job. The control board commands short motor rotations, watches through the hall sensor how quickly the rotor accelerates and how long it coasts, and calculates load size from that inertia. If your load sensing broke right after a hall sensor swap, that’s one fault with the sensor circuit, not a second component that happened to fail at the same moment.

Can a bad rotor position sensor cause an LE error?

Yes, it’s one of the recognized causes. But it is not the only one, and that’s how a lot of people end up where you are — they see LE, buy a hall sensor, install it, and the problem is still there because the actual fault was mechanical. A seized bearing, a locked or binding drum, or a failing control board can all produce the same complaint. Do the hand-spin test on an unplugged machine before you buy any more parts.

Can a brand new hall sensor be faulty out of the box?

Often enough that you should test it rather than assume it’s good. Aftermarket hall sensors in particular vary a lot in quality. Compare the three hall circuits against each other with a multimeter — if one is an outlier or reads open, the part is bad regardless of how new it is.

Where do I find the tech sheet for my washer?

On most LG washers it’s in a plastic sleeve behind the lower kick panel at the front, or taped inside the rear panel. It’s model-specific and it carries the actual test values and specs for your machine. Use it rather than numbers you find on a forum — the variants across LG’s direct drive line are different enough that generic figures will mislead you.

Why does the drum need to coast freely for load sensing to work?

Because the coast is the measurement. The board pushes the drum, cuts power, and reads how long it keeps turning. A heavy load coasts differently from a light one. If a bearing is dragging or the drum stops dead when you let go, the coast data is meaningless and no amount of sensor work will fix the sensing phase.

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The Tool You’ll Need

Digital Multimeter

Every test in this guide comes down to continuity and resistance readings, and a basic digital multimeter is the only tool that will give you them. If you’re going to guess at a part instead of testing it, you may as well buy the part twice.