E21 Serious Moderate DIY
LG Dryer E21 — Drain pump error (washer-dryer combo)
LG Dryer · Error code E21
What E21 Means
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.
Symptoms
- 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
Common Causes
1
Clogged pump filter / coin trap
Coins, lint, or hair caught at the pump intake.
2
Kinked or clogged drain hose
Hose pinched or full of biofilm/lint.
3
Drain standpipe too high or restricted
House drain plumbing limiting flow.
4
Failed drain pump
Motor open or impeller broken.
5
Failed pressure switch
Control thinks water remains when it does not.
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.
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.
More LG Dryer Codes
Verified against manufacturer documentation: lg.com
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.