LG's front-load washer guide defines OE as a drain problem: the tub did not empty within the time the cycle allows. On some models the same fault is shown as E03 or E21. LG lists three ordinary causes, a kinked or badly positioned drain hose, a clogged drain pump filter and too many suds, and all three are within reach of the owner. What is not in reach is the pump itself, which is why the sequence matters: the cheap causes first, and each one done safely.
Look at the Drain Hose Before You Touch Anything
Pull nothing yet. Look at the grey drain hose where it leaves the back of the washer and where it enters the standpipe or the laundry sink. A washer that was pushed back against the wall can pinch the hose flat. The end of the hose must sit at a height inside the range LG gives in the installation instructions, high enough that the tub does not siphon, low enough that the pump can lift the water to it, and it must not be pushed so far into a standpipe that it seals against the pipe walls. In a garage or an unheated room in winter, feel the hose; water standing in it can freeze solid.
Clean the Drain Pump Filter
The filter lives behind a small door at the bottom front of the machine. Unplug the washer first, because you are about to open a compartment next to the pump motor with water in it. If the last cycle was hot, wait until the drum and the water are cool. Put down towels and a shallow pan or baking tray that fits under the door. Open the door. Beside the round filter cap there is a short hose with a plug on the end: pull it out, aim it into the pan and remove the plug, and let the tub drain into the pan, refitting the plug and emptying the pan as often as needed. Only when the flow stops, turn the filter cap anticlockwise and draw the filter out. Expect coins, hair ties, a sock or a lump of lint. Rinse the filter, look into the housing for anything wrapped around the pump blades, and turn the blades gently by hand; they should spin freely. Refit the filter and turn it fully clockwise until it stops, cap the small hose and push it home, close the door, then plug the washer back in and run a rinse and spin to confirm the drain is quiet and the door area stays dry.
Suds Are a Drain Problem Too
Too much detergent, or detergent that is not labelled HE, makes foam that the pump cannot move, and the washer may show Sud before OE. Foam drains slowly and the cycle times out. Use the small quantity of HE detergent the cap markings indicate, less in soft water, and run a Tub Clean cycle if suds have been a habit. Powder detergent left undissolved in the filter housing is a clue.
What Points at the Pump
If the hose is clear and correctly placed, the filter is clean and the blades turn, yet OE returns on the next cycle, the drain pump or its wiring is the remaining suspect. A pump that hums without moving water, or one that is silent when the cycle reaches drain, is a replacement rather than a cleaning. Replacing it means working inside the cabinet at the pump, and that is a visit rather than an evening job.
Leave It Ready for the Technician
Do not run more cycles hoping the fault clears itself, because each one leaves the tub full and the next drain attempt starts with the same water. Leave the machine unplugged with the drum emptied through the small hose, and note whether the pump made any sound at the drain step. Book an LG washer repair with the code, the model number from the plate inside the door, and what came out of the filter.