LG Washer OE Error Code: Drain Error & What to Check First

Short answer: LG lists OE — and the newer displays E03 / E21 — as a drain error: the washer can’t drain the wash water used in the cycle, caused by a kinked drain hose or a clogged drain pump filter. LG’s documented path starts with the drain hose, then a closed-machine spin-only pump test, and only then the drain pump filter — not the filter first.

What OE means (per LG)

LG lists OE (and E03/E21 on newer models) as a drain error: the washer can’t drain the wash water used in the cycle. LG attributes it to a kinked drain hose or a clogged drain pump filter.

Code family & alternate displays

This page covers the OE drain-error family on LG front-load washers. LG uses alternate displays for the same condition — E03 and E21 appear on newer models. Display formatting varies by model; confirm the exact string on your panel against your model’s manual before acting.

Safe first checks (LG’s documented steps)

Work these in LG’s order. LG starts with the hose, not the filter.

Check the drain hose for kinks or clogs — LG’s first step. Look behind the washer and make sure the drain hose is not kinked or clogged. After clearing clogs and straightening kinks, run a spin cycle to confirm whether OE/E03/E21 has cleared.
Run a spin-only test to check the drain pump — LG’s step 2. If the hose isn’t kinked, run a spin-only cycle: press POWER, press SPIN SPEED until HIGH is selected, then press START/PAUSE, and listen for a humming sound that indicates the drain pump is running. Controls vary by model — confirm the key sequence in your model’s manual.
Clean the drain pump filter — LG’s next step. If you hear the humming sound, the pump motor is working; LG then has you check whether the filter is clogged. It sits behind the small door at the bottom front (have a towel ready — water will spill). After clearing debris, run a tub-clean cycle to see if the code clears.
If the filter is clean, consider suds. LG notes excessive suds can trigger the error by creating air pockets the drain pump can’t remove.

Important: LG’s spin-only test is an ordinary control-panel cycle on a closed machine — it is not an exposed live-voltage test. Do not open the washer or work on wiring to perform it.

Diagnostic branches

Checks clear, code returns. LG states the unit may require repair service at this point. Further diagnosis may require a qualified technician — never perform exposed live-voltage testing.
Code returns after a spin cycle. A code that returns after LG’s spin/confirm cycle suggests the condition remains and needs further diagnosis.
No drain at all. Treat it as a no-drain problem and work LG’s path in order — hose, spin-only test, then filter.

Do not replace this part yet

Don’t order a drain pump (or any part) before LG’s hose, spin-only test, and filter steps are done. LG’s sequence puts the drain hose first, then a pump-running check, then the filter. Confirm the part for your exact model number before buying — drain parts are not universal across LG families.

When to stop and call a technician

If LG’s documented steps don’t resolve it, LG states the unit may require repair service. Further diagnosis may require a qualified technician. Never perform exposed live-voltage testing; parts must be serviced with the power disconnected.

See Washer Won’t Drain for a general cheap-first drain sequence, the LG washer error-code guide for the full family, and the LG washer problems & hubs.