LG Dishwasher OE Error Code: What It Means and How to Fix It
Updated · from manufacturer service documentation
The OE code on an LG dishwasher means a drain error, and it's most often an installation issue — a kinked drain hose, a disposal connection with the knockout plug still in place, or a clogged waste tee. All three are checkable without any tools beyond your hands.
What Causes the OE Code
| Cause | Likelihood | DIY difficulty | Related part |
|---|---|---|---|
| Drain hose kinked or pinched under the dishwasher | Most common | Easy — reroute hose | Drain hose |
| Drain hose connected to a disposal with the knockout plug still in place | Common | Easy — remove knockout plug | — |
| Waste tee clogged (knockout plug not removed) | Common | Easy — remove knockout plug on waste tee | Waste tee |
How to Fix the OE Error, Step by Step
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Check for a kinked or pinched drain hose
Per LG's installation guidance, feed the drainage and supply hoses through the hole under the sink, then gradually slide the dishwasher into the cabinet while pulling on the hoses from under the sink to take up slack — this avoids kinking the hose or trapping it beneath the unit.
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If the drain hose connects to a garbage disposal, remove the knockout plug
A disposal ships with a plug in the dishwasher drain connection that must be removed before the dishwasher can drain into it.
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If you're using a waste tee instead of a disposal, remove its knockout plug too
A waste tee is clogged from the factory in the same way until its own knockout plug is removed.
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Re-run a cycle and check for leaks
LG's own final-check procedure runs a Turbo cycle after installation specifically to verify drainage and check for leaks — this is a good verification step after fixing any of the above.
Which Models This Applies To
Documented for the LG LDF5545ST and LDT7808ST dishwasher series, from the service manual's final installation check section. This OE cause list is specific to new/recent installations; for a machine that's been running fine and suddenly won't drain, also check the drain pump and filter covered on the cross-brand dishwasher-not-draining page.
See also: LG dishwasher AE, Dishwasher not draining (cross-brand).
Frequently Asked Questions
Why does my brand-new LG dishwasher show OE right after installation?
Almost always a kinked drain hose or a knockout plug left in place at the disposal or waste tee connection — all documented installation-stage causes, not defects.
What is a "knockout plug," and why does it matter?
It's a factory-installed plug blocking the dishwasher drain connection on a garbage disposal or waste tee, meant to be removed during installation. If it's left in place, the dishwasher can't drain into that connection at all.
How do I avoid kinking the drain hose during installation?
Feed the drainage and supply hoses through the hole under the sink first, then slide the dishwasher in gradually while pulling the hoses from under the sink to remove slack.
What if OE appears on a dishwasher that's been working fine for years?
That points less toward an installation issue and more toward a clogged filter or failed drain pump — see the cross-brand dishwasher-not-draining page for that diagnostic.
Based on the LG service documentation for the LDF5545ST and LDT7808ST dishwasher series. Last updated: .