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LG Washer Error Code PE: What It Means and How to Fix It

LG washer guide · Decoded from manufacturer documentation · Safe homeowner checks only

What is happening inside the machine

An LG washer does not measure water with a float the way an older machine might. It uses a pressure sensor, connected by a thin air hose to a small air chamber at the bottom of the outer tub. As water rises in the tub, it traps and compresses the air in that chamber and hose. The sensor converts that air pressure into an electrical signal, and the control board reads the signal as a water level. When the signal is missing, stuck at one value, or outside the range the board expects, it displays PE for Pressure sensor Error and stops the cycle. The timing is useful evidence. PE right after pressing Start, before any water enters, points toward the sensor, its wiring, or a stuck signal. PE partway through a fill points toward a slow or confusing level change, which is where a siphoning drain hose or a partially blocked pressure hose belongs. PE that comes and goes between cycles points toward a loose connection, because vibration during spin can break and remake contact. This is also how PE differs from its neighbours. IE means the washer did not fill within the allowed time, so the supply is the suspect. FE means the level went too high, so a valve that will not close is the suspect. OE means water did not drain in time. PE is narrower than all three: the level reading itself cannot be trusted, even when supply and drain look fine.

Finding the cause

A one time glitch clears after a full power reset

Control boards can latch a false fault after a power flicker or a disturbed cycle. A glitch is the cheapest explanation, so test it first. Unplug the washer, press and hold Start/Pause for about 5 seconds to discharge stored charge, wait at least 5 minutes, then plug it back in and run a short cycle with no load. If PE never returns, the fault was transient and no part is needed. If PE returns at the same point in the cycle, the cause is physical and the checks below apply.

The drain hose position is siphoning water away from the tub

A washer that fills and then drains on its own never builds a stable water level, and the pressure sensor reports a level that does not behave as the board expects. This happens when the drain hose end sits too low, when the hose is pushed too far into the standpipe, or when no air gap or loop breaks the siphon. Check the hose end height against your manual, which typically requires the drain point well above the bottom of the tub, and make sure the hose is not sealed tight into the standpipe. If the washer fills, then the water level visibly falls without a drain cycle running, siphoning is confirmed. Correcting the hose position costs nothing and often clears PE at once.

The pressure hose is kinked, split, disconnected, or blocked

The thin hose between the tub air chamber and the sensor carries only air, so any kink, split, loose clip, or blockage of soap scum and sediment corrupts the reading. With the washer unplugged and the water supply off, remove the top panel only if you are comfortable doing so, and trace the thin hose from the sensor down toward the tub. A hose that has come off its fitting, is pinched against the cabinet, or is cracked at a bend is a clear find. Blowing gently through the hose toward the tub can clear a light soap or sediment blockage, but stop if you meet solid resistance, since forcing air can damage the sensor. A hose that is split or hardened needs replacing, not taping, because a taped air leak will keep giving a wrong level.

The wiring to the pressure sensor is loose or damaged

Vibration is a slow enemy of small connectors. The wiring harness from the sensor to the control board can work loose at either end, chafe against the cabinet, or corrode at a terminal. With the power still off, check that the sensor connector is fully seated and that no wire is pinched, bare, or burnt looking. PE that appears randomly and then vanishes on its own is the classic signature here, because a vibrating machine remakes and breaks the same poor connection. Do not probe live wiring. If the harness looks damaged or a connector is burnt, that is a repair service job, not a reseat and hope job.

The pressure sensor itself has failed

When the reset is done, the drain position is correct, the hose is intact and clear, and the wiring is sound, the sensor is the remaining suspect. A failed sensor typically reports the same wrong level every time, so PE returns promptly and repeatably, often immediately after Start. Sensor failure is more common than a control board failure for PE, and it is a standard part on most LG models. Replacing it means working inside the top of the machine with the power off, so a confident homeowner may do it, but anyone unsure should book the repair and let the technician confirm the diagnosis first.

A control board fault is driving a false PE reading

The board is the last suspect, not the first. It earns suspicion only when a known good sensor and hose still produce PE, or when PE appears alongside other unrelated codes and erratic behaviour. Board diagnosis needs component level testing that no external check can replace, and a board is expensive enough that guessing at it wastes money. If every check above passes and PE persists, stop replacing parts and arrange a professional diagnosis.

Fixing it

1. Reset the control fully, about 10 minutes. Unplug the washer, press and hold Start/Pause for about 5 seconds, wait at least 5 minutes, then plug it back in and run a short cycle with no load.
2. Check the drain hose position, about 5 minutes. Confirm the hose end is high enough and not pushed too far into the standpipe, with an air gap that breaks any siphon. Correct the position and retest before opening anything.
3. Inspect the pressure hose, about 15 minutes. With the washer unplugged and water off, trace the thin hose from the sensor to the tub. Reseat a loose hose, clear a light blockage gently toward the tub, and note any split or hardened section for replacement.
4. Check the sensor connector, about 5 minutes. With the power still off, confirm the sensor connector is fully seated and no wire is pinched, bare, or burnt. Do not probe live wiring.
5. Retest with a small load, about 20 minutes. Run a small normal cycle and watch the fill stage. A level that rises steadily and a cycle that proceeds past the old failure point confirms the fix.

What it costs

Pressure hose first; sensor second; board last. Most PE cases end at the free checks or a cheap hose. A sensor is a moderate part, while a control board is the expensive outcome that should never be guessed at.

All prices on this page are estimates based on typical US parts and service pricing. Your model, region and the actual failed part will move the real figure.

Repair or replace note: a hose or sensor repair is almost always worth doing, since the fitted cost is a small fraction of a replacement washer. A board repair on an older machine needs a harder look: if the board plus labour passes half the cost of a comparable new washer, or if bearings, the pump, and the board all need work at once, replacement becomes the sensible choice. Drain behaviour is covered by the OE guide, and motor behaviour by the LE guide. The FE overfill guide is listed on the LG washer hub and will be linked here once published.

Mistakes that make it worse

• Replacing the sensor before checking the hose. A kinked or blocked hose gives the same code as a failed sensor, and a new sensor on a bad hose still reports PE.
• Taping a split pressure hose. An air leak is an air leak. Tape rarely seals it for long, and the level reading stays wrong.
• Blowing hard into the pressure hose. Gentle clearing is fine. Forcing air toward a delicate sensor can damage it and turn a blockage into a part replacement.
• Ignoring a siphoning drain hose. No sensor can report a stable level while water is quietly leaving the tub, so every other fix will appear to fail until the hose position is corrected.
• Guessing at a control board. Boards are expensive and PE with a good sensor and hose still needs testing. A guessed board is the costliest wrong part on this page.

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