LG · Laundry · WM4000HBA · Owner's Manual
When the power is on and the tcL message blinks on the display, it means the washer drum needs cleaning. Use the Tub Clean cycle.
Source: LG WM4000HBA Owner's Manual, extracted pages 37-38
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Cleaning the Washer Exterior and Door
Keeping the outside of the washer and the door clean helps protect the finish and reduce moisture and odor.
Safety first - Unplug the appliance before cleaning to avoid the risk of electric shock. - Do not spray water inside the washer. This may cause fire or electric shock. - Do not use volatile substances such as benzene, paint thinner, alcohol, or acetone, and do not use abrasive cleaners or detergents with strong chemical components. These can discolor or damage the appliance, or may cause a fire. - Do not touch the surface or the display with sharp objects.
LG WM4000HBA Owner's Manual, extracted pages 37-38Error 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.