PE3
LG Washing Machine
Severity: ModerateWhat Does This Error Mean?
The PE3 error on an LG washer means there is a fault with the water level pressure sensor — specifically that the sensor is detecting an abnormal signal or has lost communication with the control board. The machine cannot accurately monitor water levels and stops the cycle as a precaution.
Affected Models
- WM3900HWA
- WM4000HWA
- WM4500HBA
- WM3500CW
- Most LG front-load washers
Common Causes
- Pressure sensor air hose is kinked, cracked, or disconnected
- Pressure sensor hose is clogged with detergent residue
- The pressure sensor itself has failed
- Wiring connector between the sensor and control board is loose
- Too many suds from excess detergent giving false water level readings
How to Fix It
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Unplug the washer and allow 10 minutes for a full power reset.
A temporary signal error can cause PE3. A reset often clears it if there is no physical fault.
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Make sure you are using HE (High Efficiency) detergent in the correct amount.
Too much detergent or the wrong type creates thick suds that interfere with pressure sensor readings. Cut back to the recommended amount.
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Remove the back or side panel to locate the pressure sensor and its hose.
Refer to your model's manual for the sensor location. The sensor is a small round component with a thin rubber hose attached.
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Inspect the hose for kinks, cracks, or blockages. Blow gently through it to test airflow.
If the hose is blocked with detergent, rinse it under warm water and allow to dry before reinstalling.
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Reconnect any loose hose ends or wiring connectors and run a test cycle.
If PE3 returns after this, the sensor itself needs replacement. It is a small part a technician can swap out quickly.
When to Call a Professional
If cleaning the pressure sensor hose and resetting the machine does not fix PE3, the sensor has likely failed. A faulty pressure sensor needs replacement — it is a small, inexpensive part but located inside the machine. Expect repair costs of $80–$160 for parts and labor.
Frequently Asked Questions
What happens if I ignore the PE3 error on my LG washer?
Without a working pressure sensor, the machine cannot control how much water goes into the drum. It could overfill and flood, or run with too little water and not clean properly. Do not continue using the machine until the sensor issue is fixed.
Is the pressure sensor hose the most common cause of PE3?
Yes — a blocked or kinked pressure hose is the most common cause. Detergent residue builds up inside the narrow hose over time and restricts airflow. Cleaning the hose fixes PE3 in many cases without any parts replacement.
How do I know if my LG washer uses a pressure sensor?
All LG front-load washers use a pressure sensor to monitor water levels. It works by detecting air pressure changes in a tube connected to the drum. You can find it inside the machine — a small round component about the size of a golf ball with a thin hose attached.