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.
The bottom line on the F21 error
F21 is a 'long drain' error, and nine times out of ten the real culprit is a clogged drain pump filter or a kinked hose rather than a failed pump — a moderate job most people can do themselves. Resetting clears the code for one cycle, but it returns until you clear the actual blockage.
Start with the cheapest move: clean the drain filter and check the hose before buying any part, since the true fix is often $0. Only if the drum still will not drain does a $150-$450 pump repair become worth it.
F21 snapshot
Our own at-a-glance triage of the F21 error, from the verified data on this page. See error-code rankings → · How we score →
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)
Which Whirlpool washers get the F21 error
F21 is a classic front-load code seen most on Whirlpool Duet and Duet Sport models (roughly 2005–2015), plus later Whirlpool front-loaders and the Kenmore front-loaders built by Whirlpool that share the same platform. Top-load Cabrio/washers use different drain codes.
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 vs Whirlpool F5 E2 vs Whirlpool F8 E1: how they compare
How this code stacks up against related error codes for difficulty, urgency, and cost.
| Whirlpool F21 | Whirlpool F5 E2 | Whirlpool F8 E1 | |
|---|---|---|---|
| DIY difficulty (1–5) | 3 | 3 | 3 |
| Urgency (1–5) | 3 | 2 | 2 |
| Typical cost | $ | $ | $ |
How much does it cost to fix the F21 error?
| DIY parts | $0–$60 |
| Professional repair (parts + labor) | $150–$450 |
| New appliance replacement | $700–$1,300 |
Repair or replace?
Because F21 is usually just a clog, the true fix is often $0 — clean the filter and hose first. If a technician confirms the drain pump has failed, expect roughly $150–$450 all-in. Apply the 50% rule: if the repair quote approaches half the price of a new washer and the machine is over ~8 years old, replacing it is the smarter money.
Common replacement parts for the F21 error
| Drain pump | $50–$150 | The part most often needed if cleaning doesn't fix it | |
| Drain hose | $20–$50 | If kinked, cracked, or clogged beyond cleaning | |
| Pump filter / clean-out trap | $15–$40 | Cheap to replace if damaged during cleaning |
Prices are typical retail ranges and vary by model and supplier — always confirm the exact part number for your appliance before buying.
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 fault is deeper: a failing drain pump, a blockage in the internal hose between the tub and pump, a wiring problem, or a control fault. These are best diagnosed by a technician.
＋ − How long does the washer take before it shows F21?
The washer allows several minutes to drain before flagging a long-drain error, so F21 typically appears part-way through a cycle rather than immediately. Water often remains in the drum when it stops — clean the pump filter over a towel and pan to catch it.
Sources & manufacturer references
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.