# How to Fix LG Error SE (Motor Sensor Error)
The LG washing machine error code **SE** (sometimes displayed as **5E** on certain models) is a critical fault indicating an issue with the motor’s rotational speed feedback system. This is widely known as the **Motor Sensor Error**.
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## What the “SE” Code Means
In plain English, the SE error means the main control board cannot accurately determine the position or speed (RPM) of the drum motor.
LG washers use a direct drive system (no belts) that relies on a specific component—the **Rotor Position Sensor** (often called the Hall Sensor)—to measure the magnetic pulses created by the spinning motor. This sensor sends vital feedback to the control board to ensure the motor is spinning at the correct speed and timing for the current cycle phase (wash, rinse, or spin).
If the sensor is faulty, damaged, or disconnected, the control board loses “eyesight” of the motor’s activity. As a result, the machine will usually stop abruptly, especially when attempting a high-speed spin cycle.
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## Step-by-Step Troubleshooting and Fix
Because this error usually involves a physical electrical component failure, basic resets are unlikely to work permanently, but you should always start with the simplest solution first.
### Step 1: Perform a Power Reset (First Aid)
Before attempting any disassembly, try resetting the control board.
1. **Unplug:** Disconnect the washing machine from the power outlet.
2. **Wait:** Wait a full five (5) minutes to allow any residual charge to dissipate from the capacitors and reset the electronic controls.
3. **Plug In:** Plug the machine back in and attempt to run a short cycle (like a Rinse & Spin).
If the code reappears immediately, proceed to the physical diagnosis.
### Step 2: Access and Inspect the Sensor
* **Safety Warning:** Always unplug the washing machine before beginning any disassembly or inspection.
The Rotor Position Sensor is located behind the main washing machine drum, mounted onto the **stator** (the stationary part of the motor).
#### Tools Needed:
* Phillips head screwdriver
* Socket wrench (usually 17mm, 19mm, or 36mm, depending on the model)
#### Inspection Procedure:
1. **Remove the Back Panel:** Use a screwdriver to remove the screws holding the large metal access panel on the rear of the washer.
2. **Remove the Rotor:** Locate the large bolt securing the motor’s outer spinning plate (the rotor). Use the socket wrench to remove this bolt. Pull the rotor straight off the spline shaft.
3. **Inspect the Stator:** The rotor will expose the stator. The Rotor Position Sensor is typically a small, plastic component attached to the stationary stator, usually secured with a couple of small screws or a clip.
4. **Check Wiring:** Inspect the wire harness connector running from the sensor to the main control board. Look for signs of damage, corrosion, melting, or a loose connection.
5. **Remove the Sensor:** Disconnect the wiring harness from the sensor unit. If possible, carefully unclip or unscrew the sensor from the stator. Examine the sensor itself for visible cracks or damage.
> **Diagnosis:** If the sensor appears physically intact and the wiring is secure, the unit has likely failed internally due to heat or electrical wear and requires replacement.
### Step 3: Replace the Rotor Position Sensor
Replacing the sensor is the most common and effective permanent fix for the SE error.
1. **Obtain a Replacement Sensor:** Ensure the replacement part is compatible with your specific LG model number.
2. **Install the New Sensor:** Place the new sensor unit onto the stator and secure it with the mounting screws or clips.
3. **Reconnect the Wiring:** Plug the wiring harness firmly back into the new sensor unit.
4. **Reassemble the Motor:** Carefully place the rotor back onto the spline shaft. Make sure it seats flush against the stator.
5. **Reinstall the Rotor Bolt:** Re-secure the main rotor bolt and tighten it firmly.
6. **Replace the Back Panel:** Screw the back access panel back into place.
### Step 4: Test the Machine
Plug the washer back into the power outlet. Run a high-speed spin cycle. If the motor accelerates smoothly and completes the cycle without displaying “SE,” the issue is resolved.
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### Need a New Part?
If you have confirmed that the Rotor Position Sensor is the culprit, you will need to order a replacement part specific to your LG model.
**Check the price for a replacement Rotor Position Sensor here: https://www.amazon.com/s?k=LG+Rotor+Position+Sensor&tag=trivian-20**