NO RESTRICTIONS IN DRAIN AREA.
RTD SESOR IS BAD?
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OE error means it taking too long for drain to pump water out of the machine. Check all parts of the drain....drain filter, pump, rubber boot, drain line......If all check good, and all is clear (free flowing), then lg says the problem is that the unit is not perfectly level. The unit has to be level is all directions to drain properly. If this information helps, please rate my answer with a smiley face. I will opt out so the appliance doc can have a shot at your question as well if you find my information didn't repair the issue on your machine.....Good luck.
I opted out for appliance doc, since you requested that expert But, since doc has not responded......If you have checked all the thing I mention, including the leveling......then you pump is faulty, and need to be replace. The OE code is known by LG to be the blocked pump code. If all components of pump area, drain hose, drain boot, and unit is level.....then pump has to be faulty.....not pumping fast enough to do the job.