ErrorCodeDoctor
LG · Dryer

LG Dryer E21 error code

Difficulty: Easy · Cost: $0–$80 · Duration: 15–20m

The E21 error appears on LG washer-dryer combo units and means the tub is taking longer than expected to drain during a cycle. This is almost always caused by a blockage in the drain hose or a blocked pump filter. Checking and cleaning the drain system resolves it in most cases without needing a technician.

Common causes

  • Drain hose is kinked or bent behind the unit preventing water from flowing out
  • Drain hose has a blockage or debris buildup inside
  • Drain pump filter is clogged with lint, coins, or debris
  • Water inlet valve fault affecting the overall water management system

How to fix it

  1. 1

    Check the drain hose at the back of the unit and straighten any kinks or bends

  2. 2

    Inspect the drain hose for any internal blockages or debris buildup and clear them

  3. 3

    Locate the drain pump filter — usually behind a small access panel at the front bottom of the unit

  4. 4

    Remove the drain pump filter and clean out any lint, coins, or debris

  5. 5

    Rinse the filter under running water before reinserting it securely

  6. 6

    Restart the cycle and check if the E21 error has cleared

  7. 7

    If E21 persists after cleaning contact a technician to inspect the drain pump

Related LG Dryer error codes

1

d75

The exhaust airflow is 75% restricted — the vent system needs cleaning

easy
2

d80

The exhaust airflow is 80% restricted — the vent system needs cleaning or inspection

medium
3

d90

The exhaust airflow is 90% restricted — urgent cleaning required

medium
4

d95

The exhaust airflow is 95% restricted — stop using the dryer immediately

hard

E21 error — frequently asked questions

What does the E21 error mean on a LG dryer?

The drain pump detected an error — the tub is taking too long to drain

What causes the E21 error?

The E21 error is usually caused by: Drain hose is kinked or bent behind the unit preventing water from flowing out; Drain hose has a blockage or debris buildup inside; Drain pump filter is clogged with lint, coins, or debris; Water inlet valve fault affecting the overall water management system.

Can I fix the E21 error myself?

Yes — this is rated an easy fix that most people can do themselves, typically in 15–20m.

How much does it cost to fix the E21 error?

Fixing the E21 error on a LG dryer typically costs $0–$80, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my dryer with the E21 error?

In most cases yes, but it's best to address the E21 error soon — see the fix steps below to resolve it.