Whirlpool Washer F21 — What It Means & How to Fix It
Also shown as F-21 on some models.
F21 on a Whirlpool front-load washer indicates a drain problem — check the drain hose for kinks and clogs, then reset the control by unplugging for 5 minutes.
What this code means
Whirlpool states plainly that F21 indicates a drain problem. The two questions it asks are whether the drain hose is kinked and whether it is clogged. Once the hose is clear, a 5-minute power disconnect resets the control.
F21 belongs to the older Whirlpool front-load code style without the F#E# pairing; later front loaders show F9 E1 for long drain times.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Kinked drain hose behind the washer | Very common | Yes — no tools |
| Clogged drain hose or household standpipe | Common | Yes — no tools |
| Too many suds slowing the drain | Occasional | Yes — no tools |
| Drain pump blocked or failed | Occasional | No — technician job |
What you can try yourself
- Cancel the cycle and unplug the washer.
- Check the full length of the drain hose for kinks or places where it is crushed against the wall.
- Lift the hose out of the standpipe and make sure the end is not clogged with lint; check the standpipe itself is not backing up.
- Refit the hose loosely — do not seal it into the pipe.
- After 5 minutes without power, plug in and run a drain or rinse cycle.
Seeing the symptom rather than the code? Washer won't drain: checks that apply across brands.
When to call a technician
- The hose is clear and unkinked but F21 returns.
- Water stays in the drum and the pump is silent or only hums.
- Water appears on the floor beneath the washer.
Typical professional repair cost: Clearing a hose is free. Drain pump replacement typically costs $150–$250 including labor.
Frequently asked questions
What does F21 mean on a Whirlpool washer?
Whirlpool says F21 indicates a drain problem and asks you to check whether the drain hose is kinked or clogged.
How do I reset F21?
Fix the drain restriction, then disconnect the washer from power for 5 minutes and plug it back in.
Is F21 the same as F9 E1?
Both are drain codes. F21 is used on Whirlpool front loaders with the older code style; F9 E1 is the long-drain code on newer models.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related Whirlpool codes
- Whirlpool Washer F9 E1 The washer took too long to drain — check the drain hose setup and the pump filter; the 'hose pushed too far down the standpipe' mistake causes a surprising share of these.
- Whirlpool Washer F5 E2 The washer tried to lock its door and couldn't — usually an obstruction or grime in the latch, sometimes a worn lock assembly that needs replacing.
- Whirlpool Washer SD Too much foam — the washer paused its cycle to break down excess suds, which almost always traces back to detergent amount or type rather than a fault.
- Whirlpool Washer F8 E1 Your Whirlpool washer isn't detecting water coming in — usually a supply problem (taps, hoses, screens) rather than anything wrong inside the machine.
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