Which part is usually at fault for LG error E21?

The most commonly implicated component is the drain pump.

What is the first thing to try for LG error E21?

Straighten the drain hose, check for blockages, and clean residue from the drain pump filter.

Error E21 Stops machine US market

E21 on a LG dryer usually means: Tub drainage took too long on condensing or steam models. On a LG Dryer, code E21 points to the drain pump.

Fix it fast: Clear the drain path. Full ranked steps below.

Manufacturer source Updated Oct 17, 2026 View source

Try these in order. Stop when the code clears.

1 Clear the drain path
Easy
- Straighten the drain hose, check for blockages, and clean residue from the drain pump filter.
Source

The drain hose is kinked or clogged, or sump water has frozen on condensing models.

Airflow through the exhaust duct is restricted by roughly eighty percent.

Airflow through the exhaust duct is restricted by roughly ninety percent.

The door is not fully closed or is obstructed. On a LG Dryer, code DE points to the door.

A water-supply problem affected the steam cycle. On a LG Dryer, code E05 points to the water inlet valve.

The lint filter is missing or not seated correctly. On a LG Dryer, code F0 points to the lint filter housing.

Have a different code? Look it up instantly.