If your LG Washer is showing error code PE, the machine has detected a fault with the water level pressure sensor (also called the pressure switch or water level sensor). Error PE means the control board is not receiving a valid signal from the pressure sensor to determine how much water is in the drum. Here is how to diagnose and fix it.

⚡ Quick Fix – Top 3 Steps

1. Unplug the washer for 10–15 minutes, then restart. Error PE can sometimes occur due to a temporary sensor glitch or static charge in the control board. A full power reset clears stored fault data and allows the pressure sensor circuit to reinitialise. If the error was caused by a one-off spike, it will not return after the reset.
2. Inspect the pressure sensor hose for kinks, blockages, or disconnection. The pressure sensor connects to the tub via a thin plastic or rubber hose. If this hose is kinked, blocked with debris, or has come loose from either the sensor or the tub fitting, the sensor cannot read the water level. Check the hose along its full length and clear any blockage by blowing gently through it.
3. Test or replace the pressure sensor. If the hose is intact and the error persists, the pressure sensor itself is likely faulty. The sensor is a small round component mounted on the side of the machine near the top. It can be tested with a multimeter for continuity or replaced directly — LG pressure sensors are widely available as spare parts.

What Does LG Washer Error PE Mean?

Error PE stands for Pressure sensor Error. The LG Washer uses a pressure sensor to monitor the amount of water inside the drum. As water fills the tub, air pressure builds in a connected hose, and the pressure sensor reads this pressure to tell the control board how much water is present. When the pressure sensor fails, the board cannot tell when the correct water level has been reached, causing it to stop the cycle and display error PE.

Without a working pressure sensor, the LG Washer cannot safely control the fill cycle — it could overfill (triggering FE) or underfill (triggering IE) if the sensor fails open. Error PE is the machine’s way of halting operation before either of those conditions develops.

Common Causes of LG Washer Error PE

• Faulty pressure sensor: The sensor component itself has failed electrically and is not sending a valid signal to the control board.
• Kinked or blocked pressure hose: The thin hose connecting the sensor to the tub is kinked, collapsed, or blocked with residue, preventing accurate pressure readings.
• Disconnected pressure hose: The hose has come off the sensor inlet or the tub fitting, breaking the pressure connection entirely.
• Damaged wiring harness: The wiring between the pressure sensor and the control board is broken, corroded, or has a loose connector.
• Faulty main control board: In rare cases the control board itself cannot read the pressure sensor signal due to an internal component failure.

Step-by-Step Fix for LG Washer Error PE

Step 1: Power Reset the Washer

Press Power to turn the washer off. Unplug the power cord from the wall and leave it disconnected for 10–15 minutes. Plug it back in and try running a short wash cycle. If PE does not return, the error was caused by a temporary fault and has cleared itself.

Step 2: Locate and Inspect the Pressure Sensor Hose

Unplug the washer before performing any internal inspection. Remove the top panel of the machine (typically secured by two or three screws at the rear). Look for the pressure sensor — it is a small round disc or cylinder, usually white or grey, mounted near the top of the machine. A thin hose (approximately 5–8mm diameter) connects it to a port on the outer tub. Check the hose for: kinks or tight bends, cracks or holes, blockages from lint or detergent residue, and loose connections at either end. If the hose is blocked, remove it, blow through it to clear any debris, and reattach securely.

Step 3: Test the Pressure Sensor

Disconnect the wiring connector from the pressure sensor. Set a multimeter to the continuity or resistance setting. Touch the probes to the sensor terminals and blow gently into the pressure hose inlet on the sensor — the reading should change as air pressure is applied. If the sensor shows no change or reads open circuit at all times, it is faulty and needs to be replaced. LG pressure sensors are available for most models — search your model number plus “pressure sensor” or “water level sensor” to find the correct part.

Step 4: Check the Wiring Harness

With the washer unplugged, check the wiring connector at the pressure sensor for corrosion, bent pins, or loose fit. Trace the wire back towards the control board and look for damaged insulation or breaks. Reconnect any loose connectors firmly. If the wiring is visibly damaged, the harness section will need to be replaced or repaired.

Step 5: Replace the Pressure Sensor

If the hose and wiring are intact but the PE error persists, replace the pressure sensor. Disconnect the power, unplug the hose from the sensor, disconnect the wiring connector, and unscrew or unclip the sensor from its mounting bracket. Install the new sensor in reverse order. Ensure the hose is firmly seated on the sensor inlet and the wiring connector clicks into place securely.

How to Reset LG Washer Error PE

After fixing the underlying cause, press the Power button to turn the washer off and back on. Run a test cycle — select Cotton or Normal and allow the washer to fill. If the sensor is reading correctly, the fill cycle will start and stop normally without displaying PE. If PE returns immediately, check that the hose is fully connected and the new sensor is correctly installed.

Related LG Washer Errors

• LG Washer Error IE — Water inlet error, often related to fill cycle problems
• LG Washer Error FE — Overfill error, can occur when pressure sensor fails open
• LG Washer Error OE — Drain error
• LG Washer Error Codes – Complete Guide