PE Error on LG Washer: Pressure Sensor Fix (Step by Step)

Quick Answer

Before you buy a pressure switch, check the air dome hose first. This small rubber hose connects the tub to the pressure switch and is the cause of PE in about 40% of cases. It can kink, clog with detergent residue, or disconnect entirely. Clearing it takes 10 minutes and costs nothing. If the hose is fine, then test the pressure switch itself - it costs $15-30 to replace.

LgWasherSeverity: moderateDifficulty: intermediate82% DIY Success

Time to Fix

20–60 min

Difficulty

intermediate

Parts Cost

$15 – $32

Tools Needed

Multimeter, Phillips screwdriver

Wrong code?

Not seeing PE on your display?

Select what your appliance is actually doing and we'll take you to the right guide.

washer overfilling with water

water not draining

What Does the PE Code Mean?

LG washers measure water level using an air pressure system: as water fills the tub, it compresses air in a sealed dome, and that pressure is transmitted up a small hose to a pressure switch. The switch translates pressure into an electrical signal the control board reads. A failure anywhere in this path - clogged hose, cracked hose, or dead switch - triggers PE.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Clogged or kinked air dome hose (most common, no cost to fix)40%

Disconnected air dome hose from tub fitting or switch port24%

Failed pressure switch (transducer)14%

Main control board unable to read pressure switch signal12%

Detergent residue or water in the air dome hose blocking pressure transmission10%

Symptoms You May Notice

PE displayed, cycle stopped
Washer fills then immediately stops and shows PE
Washer overfills before PE triggers (pressure switch reading low)
Cycle restarts but PE returns when fill begins

Tools Required for Diagnosis

MultimeterPhillips screwdriverThin wire or pipe cleaner (for hose clearing)

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Locate and inspect the air dome hose

The air dome hose is a small diameter rubber tube (roughly 5mm ID) that runs from a fitting on the side or bottom of the outer tub up to the pressure switch on the control panel housing. Access it by removing the top panel (2 rear screws, slide back and lift). Trace the hose along its entire length. Look for kinks, cracks, or disconnection at either end. Squeeze the hose - it should be soft and flexible with no hardened residue inside.

Clear detergent residue from the air dome hose

Test the pressure switch by blowing into it

Replace the pressure switch

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Water Level Pressure Switch6601ER1006E · $15–$32	6601ER1006E	$15 – $32

Verify part fitment for your Lg model

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs

Labor Approach

Our Verdict

REPAIR

Estimated Cost: $24 (Parts) vs $550 (New Machine)

Frequently Asked Questions

What does PE mean on my LG washer?

PE stands for Pressure sensor Error. The water level pressure switch is not sending a valid signal to the control board. The most common cause is a clogged or kinked air dome hose, which blocks the pressure signal from reaching the switch. Check the hose before replacing any parts.

Can a clogged air hose cause PE?

Yes - it is the most common cause. The air dome hose is only about 5mm in diameter. Detergent residue accumulates inside it over time and eventually blocks the pressure signal entirely. Clearing it takes 10 minutes and costs nothing, so always start here before buying a replacement pressure switch.

How do I test an LG washer pressure switch?

Disconnect the air dome hose from the switch port. Blow gently into the port. You should hear a distinct click as the internal diaphragm activates. For a more precise test, connect a multimeter in continuity mode to the switch terminals and verify the circuit changes state when you blow into the port.

Is PE related to FE (overfill)?

They share the same sensor path. PE means the pressure switch is not reading correctly (often reading empty when the tub is full). FE means it is reading above the maximum threshold. A failed pressure switch that is stuck in the 'empty' position causes the board to keep filling - which leads to FE overfill. If you see both codes, the air dome hose or pressure switch is almost certainly the root cause.

Related Lg Washer Error Codes

Code: FELG Washer FE Error: Overfilling Code: OELG Washer OE Error: Won't Drain Code: HUBLG Washer Error Codes: Full List Code: DIAGLG Washer Diagnostic Mode

Same Fix Works on These Brands

Lg shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

Lg washerLG Washer Error Codes: Complete List With Fixes (2026)Lg washerLG Washer LE Error: Why the Motor Locked Up (Fix It Fast)Lg washerSUD on Your LG Washer? Too Many Suds (Here's the Real Fix)Lg washerLG Washer OE Code: Water Won't Drain (Troubleshooting Guide)Lg washerHow to Reset an LG Washer (Every Method, Every Model)Lg washerFE Code on LG Washer: Overfilling and How to Stop It

Models Known to Experience PE Errors

This repair applies to most Lg washers with this error code. Common model numbers include:

WM3700HWA, WM4000HWA, WM5000HVA, WM3900HBA, WM6998HBA, WM8100HVA, WM3470HWA

Last verified for technical accuracy on March 13, 2026