LG Washing Machine Error Code PE — What It Means & How to Fix It

What Does This Error Mean?

The PE error means the water level sensor in your LG washer is not working correctly. This sensor tells the washer how much water is in the drum. Without it, the washer cannot safely fill, wash, or drain — so it stops completely.

Affected Models

LG WM3900HWA
LG WM4000HWA
LG WT7300CW
LG WM2250CW
LG WM3600HWA

Common Causes

The water level sensor (also called a pressure switch) has failed
The small air hose connecting the sensor to the drum is cracked, kinked, or disconnected
The wiring harness between the sensor and the main control board is loose or damaged
A power surge or electrical glitch has confused the sensor temporarily
The main control board has a fault and is not reading the sensor signal

How to Fix It

Unplug the washer from the wall outlet. Wait at least 10 minutes before plugging it back in.

A longer reset gives the control board time to fully discharge and clear temporary glitches.
Plug the washer back in and try running a rinse and spin cycle to test.

If the PE error does not return, it was likely a temporary electrical glitch.
If PE returns, unplug the washer again and pull it away from the wall. Remove the top panel to access the water level sensor.

The top panel is usually held by screws at the back. Check your model's manual for exact instructions.
Locate the water level sensor — a small round device with a thin air hose attached. Check that the hose is not kinked, cracked, or disconnected.

If the hose is loose, push it firmly back onto the sensor nozzle. If it is cracked, it needs to be replaced.
Check that the wiring connector on the sensor is firmly plugged in. Unplug it and plug it back in to ensure a good connection.

If the connector looks corroded or the wires are damaged, a technician should handle the repair.

When to Call a Professional

Try a power reset first — unplug for 10 minutes and plug back in. If PE comes back, this is a repair that usually requires a technician. The water level sensor or control board may need replacement, costing $150 to $350 depending on the part.

Frequently Asked Questions

Is the PE error dangerous? Can my LG washer overflow?

The PE error is a safety precaution — it stops the washer to prevent overfilling. Your washer will not overflow because it shuts down when the sensor is not responding. However, you should not keep trying to run cycles until the sensor is fixed.

Can I fix the water level sensor myself?

If the problem is just a disconnected or kinked air hose, you can fix that yourself. Replacing the sensor itself is possible if you are comfortable working with appliance parts. But if the main control board is the problem, that is best left to a professional.

How much does it cost to replace the water level sensor on an LG washer?

The sensor part itself usually costs $30 to $70 depending on the model. If you hire a technician, add $100 to $200 for labor. If the main control board is the real problem instead, that part alone can cost $200 to $400.