LG WM-24321-IW frontload washer was UE error and is locked and will not drain or open

Hi from retired Englishman in SW France
For a number of LG washers 'UE' means Unbalance Error.
I would start by switching the machine off, following these guidance notes and, once you are happy that it is actually balanced, switching it back on again.
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It is necessary to ensure absolutely that the machine, even when empty, has all 4 feet very firmly on the floor, and I mean firmly ;-0)

Doesn't matter whether it is empty or not but switch it off then-
very firmly push one front corner diagonally into the centre of the machine (sorry about my UK spelling!) and see if the machine moves or rocks AT ALL, even the slightest. If it does you will need the open-ended spanner which came with the (new) machine........which of course went missing a long time ago?!! An adjustable spanner will suffice.
Adjust the foot under that corner downwards until it is very firmly- almost pushing- against the floor but not so far that the corner lifts up!
If this corner did not rock do the same to the other.
Once you cannot rock the machine the slightest little bit, screw the locking nuts up tight to the underside of the machine so that they will not move. Ideally the rear feet should also be locked.

If this has not cured the problem it is possible that the internal drum suspension is malfunctioning.

Good luck,

John C

UE = Unbalance Error.
Open access door at bottom left on front of washer. Use small hose to drain water out. Door will most likely unlock when water level is lowered.