LG Washer Error Code: PE — What It Means
The LG washer error code “PE” (often displayed as P E) signals a pressure or water-level sensing problem. This code means the washer’s control board isn’t receiving a valid signal from the pressure (air) sensor or that the sensor’s associated hose/wiring is obstructed, damaged, or disconnected. When the machine cannot determine water level correctly it may refuse to start cycles, stop mid-cycle, overfill, underfill, or display other odd behavior. Common user impacts include longer or incomplete cycles, clothes left soaking or not rinsed properly, loud or abnormal noises if the machine keeps trying to refill or drain, and in rare cases a risk of overflowing or leaks if the inlet or sensing system fails to stop filling.
Common Causes
- Faulty pressure (water level) sensor / air pressure switch.
- Clogged, kinked, pinched, or detached pressure hose between the tub and sensor.
- Loose or corroded wiring connectors or broken harness to the sensor.
- Malfunctioning main control board (faulty input reading or relay control).
- Problems with the water inlet valve causing unusual fill behavior that confuses the sensor.
- Obstructed drain pump or drain line causing erroneous pressure changes.
- Excessive suds (overuse of detergent) altering pressure readings.
- Physical damage to the tub or chassis that allows air leaks affecting the pressure tube seal.
Troubleshooting Steps
- Power cycle the washer: unplug for 1–2 minutes or flip the breaker, then restart to clear temporary faults.
- Run LG diagnostic/self-test mode to capture error history and test the pressure sensor reading (refer to your model’s tech sheet for the test sequence).
- Inspect the pressure hose: remove the front or rear panel as required and check the small rubber hose from the tub to the pressure sensor for kinks, blockages, cracks, or disconnections. Clear any debris and re-seat securely.
- Check wiring and connectors: look for loose pins, corrosion, or damaged insulation at the pressure sensor and the control board. Re-seat connectors and secure harness clips.
- Test the pressure sensor: use a multimeter to check continuity/resistance as specified in the service manual, or gently blow into the sensor tubing while observing diagnostic readings—noises or no change can indicate failure.
- Examine the drain pump and drain hose: remove lint and obstructions; a blocked drain can create unusual pressure dynamics or error flags.
- Reduce suds: ensure you are using high-efficiency detergent and the correct amount—excessive suds can trigger false pressure errors.
- Swap or replace the pressure hose and sensor: if inspection and basic tests show failure, replace the hose and/or sensor with OEM parts; inexpensive hoses are often the first fix.
- Check the water inlet valve and valves’ solenoids: if the machine is overfilling or cycling oddl