How to Fix an LG Dishwasher OE Drain Error

Before you start#

• Tools: Phillips #2 screwdriver, channel-lock pliers, flashlight, a bucket, towels, and a multimeter for pump testing.
• Safety: Cut power at the breaker before working on the pump. Standing water in the tub is normal with OE — bail most of it out before you go underneath.

Step by step#

1. Clean the filter first (it clears about 50% of OE errors). Remove the racks and pull the center-bottom filter straight up with no twist — there is a mesh cup and a flat fine-mesh plate beneath. Rinse and scrub both, and check the sump for glass, bone, stickers, or toothpicks that block the pump inlet. Refit the flat plate, drop the cup back in, and run a rinse; if OE clears, you are done.
2. Check the hose routing under the sink. The drain hose must rise in a high loop to countertop level before dropping to the disposal or drain — that prevents backflow, and a kink here is the second most common cause. Straighten kinks, run the disposal to clear a shared drain, and if there is a countertop air gap, pull its cap and check inside for blockage.
3. Check the disposal knockout (new installs). On a freshly connected disposal, confirm the knockout plug was punched out — that plastic disc blocks the dishwasher drain port. Shine a light into the disposal's dishwasher port, and if you see a solid disc, knock it out from inside with a screwdriver and retrieve it.
4. Flush the hose. With power and water off, disconnect the drain hose at the disposal or sink and hold it over a bucket: gravity flow means the path from the pump is clear, while no flow with water still in the tub means an internal blockage or a stuck check valve. Pull the hose off the pump outlet too and flush it with a garden hose — years of grease often form a plug inside.
5. Test the drain pump motor. Drop the lower access panel (4 Phillips screws) and find the compact cylindrical pump on the left of the tub base with two hoses and a 2-pin plug. Unplug it and meter across the terminals: 5-15 ohms is a good coil, an open (OL) reading is a burned winding, and near-zero is a short — replace with 4681EA2001T in either failure.
6. Check for an impeller jam. If the coil reads good (5-15 ohms) but it still will not drain, pull the pump inlet hose, look in with a light, and try to spin the impeller with a small screwdriver; clear any glass or debris, and replace the pump if blades are broken or missing.
7. Replace the pump if confirmed failed. Pull both hoses (compress the spring clamps — water will spill), release the mount screw or twist-lock, and fit the new 4681EA2001T: mount it, reconnect the outlet and inlet hoses with their clamps, and plug in the 2-pin connector.
8. Test and verify. Refit the panel, restore water and power, and run a Rinse Only cycle — it fills briefly then drains. Listen for the pump hum, watch the hose joints for leaks, and confirm the tub empties fully. If OE returns, run Smart Diagnosis through the ThinQ app for a secondary issue.

OE quick guide#