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LG WM4000HWA Washer Displaying OE Error? Diagnose the Drainage Problem
A load of laundry finishes, but the door remains locked and water is still visible behind the glass. The display shows OE, and restarting the wash cycle changes nothing. On the LG WM4000HWA front-load washer, this code indicates that the machine has not drained water within the expected time.

The interesting part is that the drain pump is not necessarily defective. A blocked filter, restricted hose or even a clogged household drain can produce the same symptom. The best way to approach this problem is to separate the washer's drainage system from the plumbing connected to it.
First, find out where the water stops
Imagine the washer has completed its washing stage but cannot move on to spinning. Before removing anything, listen briefly during a drain attempt.

• A humming sound may indicate that the drain pump is receiving power, although it does not prove that water can pass through it.
• Complete silence may suggest an electrical or pump-related problem.
• Water moving slowly through the drain hose points towards a restriction somewhere in the discharge route.
  These observations are clues, not definitive diagnoses. The LG manuals for the WM4000HWA explain the OE error and identify the drain filter and hose as important inspection points.
  The filter inspection: prepare for more water than expected
  The drain pump filter is located behind the small access panel near the bottom front of the washer. It catches objects such as coins, lint and small pieces of fabric.

Before opening it, switch off and unplug the appliance. Prepare a shallow container and several towels. Water trapped inside the machine can escape during cleaning, and it may still be hot after a recent wash.

Use the small emergency drain hose behind the access cover to empty the remaining water. Remove its cap carefully and let the water flow into the container. Once drainage has stopped, close the hose.

Now turn the pump filter cap counterclockwise and remove the filter. Clear away accumulated debris and rinse the component. A soft brush can help remove compacted lint.

Reinstall the filter securely and replace the access cover. A loose filter cap can cause leakage during the next cycle.
A simple test separates two different blockages
If the filter is clean but the OE code returns, investigate the drain hose.

Check the visible section behind the washer. It should not be crushed against the wall, sharply bent or compressed underneath the appliance.

There is another useful diagnostic method: checking whether water can leave the washer through the drain hose independently of the household drainpipe.

This test involves disconnecting the hose from the household drain connection and directing its outlet into a suitable drain or container. Run a spin-only cycle while monitoring the discharge. Do not leave the hose unsecured or allow water to overflow.

If water flows normally, the household drain connection may be blocked. If the washer still cannot discharge water, the obstruction or failure is more likely within the appliance.
When cleaning does not solve the OE problem
A clean filter and unrestricted hose do not rule out a defective drain pump. The pump impeller, electrical connections or control system may require further inspection.

If the pump makes unusual noises, repeatedly stops or fails to move water despite an unobstructed drainage route, stop testing and arrange professional service.

Do not open electrical compartments or attempt to test powered components yourself.
Keep the model documentation at hand
The WM4000HWA has its own installation and maintenance specifications. In particular, its drain hose must not discharge from a height greater than 96 inches (2.4 metres) above the bottom of the washer. Incorrect installation can contribute to drainage problems.

LG manuals provide the relevant instructions for filter maintenance, hose positioning and error-code interpretation. Always confirm the complete model number before following repair advice, because procedures can differ between LG washer generations.

The OE code is a starting point for diagnosis, not a reason to order a new pump immediately. Separating a filter blockage, hose restriction and household plumbing problem can save both time and unnecessary repair expenses.