LG · Laundry · WM4000HBA · Owner's Manual
OE is a water outlet error. Check that the drain hose is not kinked, pinched, or clogged, and make sure the end of the drain hose is lower than 96 inches (2.4 m) above the bottom of the washer.
Source: LG WM4000HBA Owner's Manual, extracted page 44
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Error 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 44Operation Problems: Leaks, Detergent Dispensing, Filling, and Cycle Behavior
This section helps you troubleshoot common washer problems such as leaks, detergent not dispensing correctly, filling issues, pauses during a cycle, and the washer stopping or not starting.
Banging noise when the washer is filling with water
LG WM4000HBA Owner's Manual, extracted pages 46-48This answer is only published when it has a reviewed answer status and a source citation back to the manual text.