Whirlpool, Maytag & Kenmore Washer F21 Error Code: Meaning, Causes & Fix

Long drain — the washer is taking too long to drain (Whirlpool's drain fault; F9E1 is its sibling rendering on Duet platforms).

F21 means the control ran the drain pump and the water level didn't fall fast enough. On Whirlpool front-loaders the pump filter (behind the lower front panel on most, or at the pump on others) is the leading cause, then hose/standpipe restrictions, then the pump. The machine stops with water in the tub and the door locked until it can drain or be drained manually. Read F21 as a stopwatch verdict rather than a parts verdict. The Duet control gives the drain eight minutes, flags Sud at the halfway point, then shuts the water valves and posts F21 — and everything that can consume those minutes is a suspect: debris at the trap, a plug in the bellows hose ahead of the pump, a kinked, frozen, or overloaded hose run, a standpipe that cannot accept the flow, foam standing in for water, or a pump that has lost its push. The Kenmore Elite HE3 and Maytag machines built on this platform post the identical fault because they share the drain hardware and the same timing logic, which is why the fix order never changes with the badge: prove the path, then judge the pump, then — only on a machine that visibly drains well — question the level sensing.

What causes the F21 code on a Whirlpool washer?

Clogged pump filter/trap

Coins, lint mats and small garments collect at the pump trap.

Drain hose/standpipe restriction

Kinks, lint plugs, hose pushed too deep.

Jammed or failed drain pump

Debris in the impeller; open windings.

Suds slowing drainage

Heavy oversudsing foams the pump out — it churns foam instead of moving water.

Frozen drain hose in cold weather

Whirlpool's Duet manual lists a frozen drain hose among the F21 checks alongside kinks and clogs, and it is the version owners overlook because nothing inside the machine has changed. A hose run through an unheated garage wall, a crawl space, or along an exterior wall can ice shut overnight; the pump then runs against a solid plug, the level never falls, and the eight-minute long-drain limit expires. F21 that appears only during a cold snap, in a machine that drained perfectly the week before, belongs to this branch until the hose is proven open.

Tub-to-pump hose blocked before the trap

The short, wide hose between the bottom of the tub and the pump inlet can swallow a sock, a washcloth, or a wad of lint that never reaches the filter you can unscrew. The trap then looks disappointingly clean while the real plug sits upstream of it, starving the pump. This is the classic F21 where cleaning the coin trap changes nothing: water still crawls, because the restriction is in the bellows hose feeding the pump rather than in the pump housing itself.

Drain outlet lifted above the manual's ceiling

The Duet manual's own F21 checklist asks whether the drain hose sits more than 96 inches (2.4 m) above the floor. A washer moved into a basement with a high sewer entry, or a hose rerouted up and over to a distant standpipe, can push the pump past what it can lift continuously. The pump is healthy and the path is clear, yet every drain runs long against the extra head until the control calls it a fault.

Checks to run before you replace anything

1. Drain via the pump trap (tray ready, slow) and clean it — on models without an access door, the trap is at the pump from below/rear.
2. Check the hose run and standpipe entry.
3. Listen to a drain attempt: buzzing = jam; strong pump sound + slow emptying = downstream restriction or suds.
4. Time the failure against the manual's clock: on this platform the Sud indication appears after roughly four minutes of unsuccessful draining and F21 follows about four minutes later, when the total drain time passes eight minutes and the water valves are shut off — a machine that faults much sooner usually has a hard plug or a dead pump rather than a marginal path.
5. Clear the display the Duet way before retesting: press PAUSE/CANCEL twice, as the manual directs for F21, then run a Drain and Spin with the tub empty and watch the standpipe — a brisk, steady stream that finishes quickly means the earlier fault was load- or foam-related, while a repeat crawl confirms a physical restriction.
6. Work the manual's four hose questions in order before removing panels: is the hose kinked, is it frozen, is it clogged, and is its outlet higher than 96 inches (2.4 m) above the floor — a yes to any one of them is a complete F21 explanation that needs no parts.
7. If the trap was clean, squeeze and flex the tub-to-pump bellows hose by hand (power off): a soft, shifting mass inside it, or a section that feels packed compared with the rest, locates the upstream blockage that the trap clean missed.
8. Note what the Maytag-built siblings add to the picture: Maytag's manual for the same platform lists the pressure switch and the central control alongside the pump for F21-type drain faults, so a machine that drains visibly well yet still logs the code has moved from plumbing into level sensing.

How to fix error code f21 on washing machine?

1. Clean the trap; clear the pump of debris (unplug first).
2. Clear/re-route the hose; clear the standpipe.
3. Replace the pump if it tests open or the impeller is damaged.
4. If suds caused it: dose correction + cleaning cycle (see Sd).
5. Thaw a frozen hose gently and reroute or insulate the exposed run; never pour boiling water into a frozen hose or force the pump against ice — let the path open fully, then prove it with an empty Drain and Spin before washing again.
6. Remove an upstream blockage by taking off the tub-to-pump hose (power off, water drained through the trap first), clearing the sock or lint mass from its folds, and checking the pump inlet behind it before refitting both clamps securely.
7. Bring an over-high drain outlet back within the manual's limit: lower the standpipe entry or reroute the hose so its highest discharge point stays at or below 96 inches (2.4 m) above the floor, then retest under a full load, not just empty.

The part that usually fails: Drain pump

Continuity test across terminals; open = replace. Stripped impellers 'run' but don't pump — equally failed.

Maytag washer f21 error code reset

Power-cycle after clearing; run Drain+Spin empty to confirm normal emptying, then the code stays clear.

Whirlpool-built washers clear most codes with a power reset: unplug for 1 minute (top-load models with a cycle-status display sometimes need the lid opened and closed 6 times within 12 seconds after power is restored — the well-known lid-sequence calibration/clear procedure on VMW top-loaders). Codes stored in the control's fault history remain readable in diagnostic mode even after they stop showing on the display, which is why a code that 'went away' can still be found by a technician.

Why does the F21 code keep coming back?

F21 returning with a clean trap points downstream (house line) or at a weakening pump under full-load head. An F21 that returns a week after a satisfying trap clean usually means the clean treated the symptom's location, not its source. Lint and small items keep arriving from the same place: overfilled loads that wash socks over the tub rim, pockets that were never emptied, a bellows hose that sheds its trapped wad one piece at a time. Note also the seasonal pattern — a drain that faults only in deep winter is the frozen-hose branch announcing itself — and the relocation pattern, where F21 begins the day the washer moves to a higher drain outlet. Matching the recurrence to what changed turns the second F21 from a repeat job into a final one.

How to stop F21 coming back

• Clogged pump filter/trap: Coins, lint mats and small garments collect at the pump trap.
• Drain hose/standpipe restriction: Kinks, lint plugs, hose pushed too deep.
• Jammed or failed drain pump: Debris in the impeller; open windings.

Retrieving stored fault codes on Whirlpool washers

Whirlpool platforms have a well-documented diagnostic mode. On front-load (Duet and later) models: with the machine in standby, press and hold any one button for 3 seconds, release for 3 seconds, repeat for a total of three holds — the display lights up and shows stored fault codes (F-codes with E-suffixes), which you step through with the same button. On top-load VMW models (most Maytag/Whirlpool/Kenmore top-loaders since ~2010): turn the cycle knob with a specific left/right sequence (commonly counterclockwise once, then clockwise three, counterclockwise one, clockwise one) until all status LEDs light, then use the knob to read fault codes as LED blink patterns. The tech sheet inside the cabinet lists the exact sequence and code chart for your model — use it rather than a generic chart, because code meanings shifted between Duet, Cabrio/Bravos and VMW generations.

Other Whirlpool washer error codes

See the full list on the Whirlpool Washer error codes hub.

Codes F21 gets confused with

F9E1 — Drain pump system error — long drain / drain failure (Duet-platform rendering of the F21 fault). F9E1 is Whirlpool's drain fault on the Duet/VMW-era code system: the pump ran and the level didn't fall in time.

LF — Long fill — the washer is taking too long to fill (water inlet fault). LF means the control opened the inlet valves and the level rose too slowly.

OL — Overload — the load size exceeds the washer's capacity (displayed oL on Cabrio/Bravos/Oasis top-loaders, stored as F70 on that platform and as F0E3 on newer F/E platforms). OL (oL) means the control judged the load too heavy to proceed.

RL — rL (remove load) — items were detected in the drum during the Clean Washer with affresh cycle. The manuals print it lowercase 'rL' and gloss it in brackets as (remove load); on some models the same condition is written F34. rL is documented in Whirlpool and Maytag front-load owner manuals, in two places: the troubleshooting table ('"rL" (remove load) appears in display — load detected in drum during Clean Washer with affresh cycle') and the Clean Washer cycle description itself.

Working from a symptom instead? Read our troubleshooting guide for this problem.

Frequently asked questions

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Facts on this page were checked against manufacturer documentation: manualowl.com · manualowl.com · producthelp.whirlpool.com · producthelp.whirlpool.com · producthelp.whirlpool.com · producthelp.whirlpool.com · producthelp.whirlpool.com · producthelp.whirlpool.com · nelihome.com · nelihome.com