LG · Laundry · WM4000HBA · Owner's Manual
An OE message blinking on the display means the drain pump filter is clogged with dirt. Clean the drain pump filter.
Source: LG WM4000HBA Owner's Manual, extracted pages 40-41
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Clean the drain pump filter
The washer can fail to drain if the drain pump filter becomes clogged. LG recommends cleaning the drain filter periodically to help prevent clogging from foreign objects.
Before you start - Turn off the washer and unplug the power cord. - Be careful: if there is water in the drum, opening the drain filter can cause water to overflow. - Use a bucket if the drum is not completely drained before you open the drain filter. - Do not use the washer without the drain filter, and do not use it with the drain filter assembled incorrectly. This can cause leaks or malfunction.
LG WM4000HBA Owner's Manual, extracted pages 40-41Error Codes and Washer Fault Messages
When an error code appears on the washer display, it tells you what type of problem the washer has detected. Use the code to identify the issue, then follow the matching solution below.
UE — Unbalance Error The load is too small, the load is uneven, or the items are too different in weight.
LG WM4000HBA Owner's Manual, extracted page 44This answer is only published when it has a reviewed answer status and a source citation back to the manual text.