LG Dishwasher OE Error Code — What It Means
The OE error code on an LG dishwasher means the unit has detected a drain issue. The dishwasher did not fully drain water within the expected time frame. This is almost always caused by a physical blockage or restriction somewhere in the drain path, not a pump or control board failure. LG’s service documentation describes OE as a drain problem tied to water remaining in the tub after the drain cycle should have completed.
Common Causes
- Clogged filter or food residue The dishwasher filter is blocked with food particles, grease, or debris and water cannot pass through to the drain pump.
- Kinked or pinched drain hose The drain hose under the sink is bent, crimped, frozen, or physically obstructed and water cannot exit the appliance.
- Blocked air gap If your installation uses an air gap on the countertop, the internal passage is clogged with debris and prevents drainage.
- Garbage disposal knockout plug not removed The dishwasher inlet knockout plug inside the disposal was not punched out during installation, or plastic debris remains in the waste spigot.
- Drain hose installation restriction The drain hose exceeds the 12-foot maximum length or is routed in a way that restricts flow.
Step-by-Step Fix
- Power off the dishwasher and open the door, then remove any loose food debris or standing water from the bottom of the tub.
- Remove and clean the filter assembly by twisting or lifting it out per your model’s instructions, rinse away all food residue and grease, then reinstall it securely.
- Inspect the drain hose under the sink for kinks, pinches, blockages, or freezing, straighten or reroute the hose as needed, and confirm total hose length does not exceed 12 feet.
- Check the air gap if your installation has one by removing the chrome cap on the countertop, clearing any debris from the internal passages, and rinsing clean.
- Verify the garbage disposal knockout plug was removed by reaching into the dishwasher inlet on the disposal and feeling for the plastic disc, remove any remaining plastic debris from the waste spigot.
- Clean the spray arms by removing them and rinsing out any clogs in the spray holes, then reinstall.
- Run a drain test by starting a cycle and observing the first 45 seconds (drain-only phase on many models) or use the CANCEL & DRAIN function if available, confirm water drains completely and the OE code does not return.
Parts Often Needed
| Part | Notes |
|---|---|
| LG dishwasher drain filter assembly | Amazon | Replacement filter if the original is cracked or damaged during cleaning. |
| Universal dishwasher drain hose | Amazon | Replacement hose if the original is kinked, cracked, or frozen beyond repair. |
| Countertop air gap kit | Amazon | Replacement air gap assembly if the internal passages are permanently clogged or the unit is corroded. |
When to Call a Pro
If you have cleaned the filter, cleared the drain hose and air gap, verified the disposal knockout plug was removed, and the OE error still appears after running a drain test cycle, the drain pump or a wiring fault may be the cause. At that point, contact an LG-authorized service technician for diagnosis. Also call for service if you are uncomfortable working under the sink or disconnecting plumbing, or if the dishwasher is still under warranty.