F21Serious
LG Washer F21 Error Code
Washer took too long to drain (over 10 minutes).
Common causes
- Clogged drain pump filter
- Blocked or kinked drain hose
- Failed drain pump
How to fix it
- Unplug washer
- Clean drain filter at bottom front
- Check drain hose for obstructions
⚠ When to call a pro: If error continues even after cleaning, replace drain pump.
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Always unplug the appliance (and turn off the water for washers/dishwashers) before inspecting. These guides are for information only and are not a substitute for a professional repair.