Whirlpool Washer F21 Error
What it means
The F21 error on a Whirlpool front-load washer means the water is draining too slowly (a 'long drain' error). It's most often caused by a clogged pump filter or a kinked/blocked drain hose — usually a fix you can do yourself.
Common causes of the F21 error
- Clogged drain pump filter (lint, coins, debris)
- Kinked, clogged, or improperly installed drain hose
- Drain hose pushed too far into the standpipe (siphoning)
- Excess suds from using non-HE detergent or too much detergent
- Faulty drain pump (less common)
How to fix the Whirlpool Washer F21 error
- 1Unplug the washerAlways disconnect power before working on the machine.
- 2Check the drain hoseMake sure the drain hose isn't kinked or clogged and isn't pushed more than a few inches into the standpipe. Straighten it for proper water flow.
- 3Clean the drain pump filterRemove the lower front kick panel, place towels and a shallow pan, then slowly twist out the pump clean-out to drain water. Rinse off lint, coins, and debris, then reinstall it firmly.
- 4Use only HE detergentSwitch to HE (high-efficiency) detergent and use the recommended amount — excess suds can trigger F21.
- 5Run a short cycle to testPlug back in and run a rinse/spin cycle to confirm it drains normally and the error is gone.
🧰 When to call a professional
If the filter and hose are clear but F21 keeps returning, the drain pump or control board may have failed — call an appliance technician.
Whirlpool F21 error — FAQ
What does F21 mean on a Whirlpool washer?
It's a 'long drain' error — the washer detected that water is draining too slowly, usually due to a clogged filter or drain hose.
Can I fix the Whirlpool F21 error myself?
Usually yes. Cleaning the drain pump filter and checking the drain hose resolves it in most cases. No special tools are needed.
Why does F21 keep coming back?
If it returns after cleaning the filter and hose, the drain pump is likely failing and should be replaced by a technician.
Sources
This guide is independently written and not affiliated with Whirlpool. Always unplug appliances before servicing and follow your model's manual. Error codes and steps can vary by model — when in doubt, consult a qualified technician.