GSM1800NWW GE 18 Dishwasher Won't Drain. I've eliminated all the likely problems. There is no apparent blockage from the drain filters to the sink drain. The drain pump fires when hot-wired.

SOURCE: bosch classixx dishwasher not draining

try removing pump some models can be serviced fron inside well of machine glass can stop the pump from turning
clean out water and remove filters find a screw in base of well remove and remove pump housing check with torch to see if any obstuctions there if not see if the impellor moves around when turned and make shure that the pump is not worn out

SOURCE: Dishwasher does not drain, instead drains through overflow valve in sink. No apparent clog seen.

Usually the sink connection is not an overflow, it is the main drain from the dishwasher. It is more likely your s-bend is blocked under the sink- try putting a bucket under it and unscrewing the u-shaped piece and cleaning out (remember don't wash it in that sink while the pipe is off)

SOURCE: lg - LDS5811ST Dishwasher OE Error Code

hi
The most common cause of an OE error code on a modern LG dishwasher is:
1. Blocked drain hose
2. Obstruction in the sump area (beneath the filter, which needs to be removed to check for onstruction)
3. Failing drain motor. 
else you need to REPLACE THE PCB POWER CONTROL BOARD

SOURCE: dishwasher doesn't drain completely after full cycle

If there is any blockage in your diposal, water will comes up to the sink, since it happened to me. As soon I installed the air gap then it fixed the problem. No air gap, water flowing is slowing down conflicting with timed draining causing this problem. Let's think of this, if you fill up water in a 1/2 galon milk container, and you try to emty it. If you pull down straightly , it will be slow compared to pull it at an agle to let air going into the opening. The air vent helps water flow better meeting the timed draining.

SOURCE: Dishwasher won't drain when cycle

Hi
Dishwasher not draining issue usually occurs due to kinked drain pipe, clogged drain filter or drain pump. First make sure that the drain is not clogged and remove clogs if present. If no visible lint is present then remove the lower front access panel to check the drain filter and drain pump for any clogs, you'll need to clean the drain filter and drain pump completely. Also, check for any food pieces stuck near the pump impeller & clean the chopper assembly. Please note that dishwashers don't drain out the complete water such that heating element doesn't overheat. Hope this helps... Please post back for any further assistance.
Daniel