LG · Dryer Serious
E21 — Drain pump error (washer-dryer combo)
On LG washer-dryer combo units, E21 indicates the drain pump did not move water out of the tub within the allowed time. The dryer phase cannot start until the wash water is fully evacuated.
- Keep using it?
- Limited use only
- DIY difficulty
- Moderate
- Verified against
- lg.com ↗
How to fix it
- Open the lower access panel and unscrew the pump cleanout filter (have a towel ready — water will spill).
- Clear any debris, rinse the filter, and reinstall.
- Pull the unit out and check the drain hose for kinks or clogs; flush with warm water.
- Confirm the drain standpipe meets LG's height spec.
- If E21 persists, test the drain pump motor windings and replace if open.
- If pump tests good, suspect the pressure switch / level sensor and replace per service manual.
Why it happens
Typical signs: E21 on display at end of wash phase or before dry phase · Standing water in tub · Pump hums but no flow · Long, slow drains in recent cycles
- Clogged pump filter / coin trap Coins, lint, or hair caught at the pump intake.
- Kinked or clogged drain hose Hose pinched or full of biofilm/lint.
- Drain standpipe too high or restricted House drain plumbing limiting flow.
- Failed drain pump Motor open or impeller broken.
- Failed pressure switch Control thinks water remains when it does not.
Parts you may need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
- LG washer-dryer combo drain pump Common replacementAmazon →
More LG dryer codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: lg.com.