Quick answer: F02 and F21 are Whirlpool's drain error codes. F02 means "drain too slow" (water level decreasing slower than expected). F21 means "no drain detected" after 8 minutes. Both indicate drain pump issues — usually clogged pump filter (40%), failed pump assembly (40%), or kinked drain hose (20%). Most reliable fix on front-loaders: replace pump assembly OEM 280187 — $141, 90 min job.
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Most likely culprit: Clogged pump trap or failed pump assembly (80% combined).
Time to fix: 30-90 minutes.
Difficulty: Medium — front-loader requires removing front panel.
If your Whirlpool front-load washer displays F02 or F21, the problem is in the drain system. F02 = slow drain (sensor detects water level decreasing slower than threshold). F21 = drain timeout (no drain after 8 minutes). Both lead to same diagnostic path.
Cause 1 — Pump filter/trap clogged (40%)
Front-load Whirlpool washers have an external pump filter (often called "drain trap") near the bottom-front. It catches coins, hair clips, lint balls. When clogged, water can't reach pump impeller.
How to confirm:
- Locate access panel at bottom-front of washer (small door or kickplate).
- Place towel + shallow pan below.
- Open trap (twist counter-clockwise, slowly).
- Inspect — if blocked with debris → that's the issue.
The fix: Clean trap manually. Free, 15 min. Try this BEFORE replacing pump.
Cause 2 — Pump assembly failed (40%)
If trap is clean and error persists, the pump motor or impeller has failed. Symptoms: humming sound during drain or complete silence, F02/F21 keeps appearing.
How to confirm:
- With washer unplugged and front panel removed, locate pump assembly.
- Multimeter test pump motor (resistance should be 5-15 ohms).
- Visually inspect impeller for damage or stuck objects.
The fix: Replace drain pump assembly. OEM 280187 for most Whirlpool front-loaders. Typical price $130-150. Difficulty: Medium — 60-90 min.
See Whirlpool Drain Pump Assembly 280187 →
Cause 3 — Drain hose kinked or clogged (20%)
The drain hose can kink behind washer (after moving) or clog with soap residue + lint over years.
How to confirm:
- Pull washer 6 inches from wall.
- Inspect drain hose — should be straight, not bent sharply.
- Disconnect from standpipe → blow through. Air should pass freely.
The fix: Straighten kinks (free) or replace hose ($15-25). Difficulty: Easy — 15 min.
Specs at a glance
| Item | Detail |
|---|---|
| Compatible models | WFW5605MW, WFW6605MW, WFW8620HW, WFW9620HC, +30 |
| Typical part cost | $130-150 (full assembly) / $0 (clean trap) / $15-25 (hose) |
| Repair time | 15 min (trap) / 60-90 min (pump) / 15 min (hose) |
| Tools | Phillips screwdriver, towels, shallow pan, pliers |
| OEM | 280187 (Whirlpool front-load drain pump assembly) |
How to clear F02/F21 error after fix
- Power off washer for 60 seconds.
- Power on, run a Drain & Spin cycle.
- If error doesn't return → fixed.
- If error returns → recheck cleanings, then replace pump.
Frequently asked questions
Q: Difference between F02 and F21?
A: F02 = slow drain (water level decreasing too slowly). F21 = no drain detected after 8 min timeout. Same root cause — drain restriction.
Q: My washer is top-load and shows different error code. Same fix?
A: Top-loaders typically use Whirlpool drain pump WP3363394 ($43, simpler install). Different model entirely. See top-load drain pump guide.
Q: I cleaned the trap and error still appears. What now?
A: Run trap clean again — debris can be inside the impeller area. If clean trap doesn't fix, replace pump assembly.
Q: Pump assembly $140 seems expensive. Cheaper alternative?
A: Generic pumps run $40-80 but compatibility issues common. Whirlpool fronts have a specific 3-bolt mount. Stick with OEM 280187 unless you're willing to risk return shipping.
Q: Can I run the washer while pump is removed?
A: No — washer needs functioning drain to complete cycles.
Q: How long should a Whirlpool front-load drain pump last?
A: 7-10 years with normal use. Coins and bra wires are #1 killer.
Q: Will Whirlpool warranty cover this?
A: Standard warranty is 1 year. Extended warranty 5 years. Outside warranty = DIY or service call ($200-300).
Related parts you may need
- Whirlpool Washer Drain Pump WP3363394 — for TOP-LOAD models (cheaper)
- Whirlpool Washer Clutch Assembly 285785 — fix spin issues
- Whirlpool Washer Agitator Cam 285811 — for top-load agitation issues
When to call a professional
- Standing water inside drum after cycle — likely seal failure or major pump damage
- Washer leaking from base — tub seal failure, complex repair
- Repeated F02/F21 within weeks — internal balance/sensor issue
DIY drain pump replacement: 75% success rate first attempt.
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Written by Vinh Nguyen · Founder of RepairKitHub.
Last updated: 2026-05-08