Clogged drain in front load LG Washer. Cleaned filter and the drain hose in bottom is not draining any water. Clogged up

The LG error code OE simply means "the pump is blocked". Presumably the water isn't being emptied properly. As with all error codes it is possible that there is a cause other than the exact description in the error code explanation but basically this error means as far as the washing machine is concerned it thinks the water isn't pumping out. A pump, or filter blockage is the most common cause but it could be caused by other faults such as a faulty pump, or even a blockage in the drain hose or somewhere else in the system etc.

LG themselves have some information on this error code..

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To completely clear any clogs in the washing machine drain, use a pipe auger (snake) through the drain hose and look out for any debris/cloth that might be clogging the hose.
Remove the drain hose from the back of the washing machine. This is normally held in place by a clamp or a couple of screws.
look for any clogging from the orifice which opens up for the drain.
if this doesn't solve the problem, you have to open the machine to look for blockage in the drums, which is better handled by a serviceman.