Whirlpool Washer F21 Error Code: The Complete Fix Guide (Most Common)

The Whirlpool Washing Machine code F21 means: Drain error (long drain) — water not draining fast enough. The #1 most common Whirlpool washer code.

Difficulty: Moderate — DIY-able with basic tools

What to do, step by step

1. Unplug the machine.
2. Clean the drain pump filter: unscrew the cap behind the small bottom panel — expect 1-2 gallons of water.
3. Check the drain hose for clogs.
4. If clean and still F21, test the drain pump (should read ~10-20 Ω) and replace if open.

Video walkthrough

Is the repair worth it?

Before spending money, run the numbers: if the repair quote is more than about 30% of what a new washing machine costs — especially on an older unit — replacement is usually the smarter call.

Check your quote with our free calculator →

Other Whirlpool error codes

Decoding a different code? Our error code lookup tool covers 200+ codes across all major brands.

Safety first: unplug the appliance (and shut off gas where applicable) before any inspection. If you smell gas, leave the area and call your gas provider.