Kenmore Washing Machine F21 error code

The washer took too long to drain. If the drain time runs past about 8 minutes, the control stops the cycle and shows F21.

Also shown as: F21, F 21, SD

Last updated: October 6, 2026

Quick answer: Kenmore washing machine error code F21: washer can't drain in time. The most common cause is clogged drain pump filter (coins, lint, hair, small socks). Try this first — power-reset the washer. If that does not clear it, straighten and check the drain hose.

What causes the F21 error?

  • Clogged drain pump filter (coins, lint, hair, small socks)
  • Kinked or clogged drain hose
  • Drain pump not running or failed
  • Loose wiring to the drain pump, pressure switch, or control board
  • Excessive suds slowing the pump down

How to fix Kenmore F21 — step by step

Work through these in order, from simplest and safest first. Stop as soon as the code clears.

  1. Power-reset the washer
    Unplug the washer for at least 30 minutes to reset the central control unit. Plug it back in, press Stop twice, and try a Drain/Spin cycle. A short glitch sometimes clears with a long reset.
  2. Straighten and check the drain hose
    Pull the washer out and make sure the drain hose is not kinked, pinched, or clogged. Confirm the hose is not pushed more than about 8 inches into the standpipe.
  3. Clean the drain pump filter
    Remove the lower front access panel. Place towels and a shallow pan under the filter cap, then unscrew it slowly. Pull out lint, coins, and debris, rinse the filter, and screw it back in. Run a drain cycle to test.
    Safety warning: Water will spill when you open the filter. Unplug the washer first and keep towels ready.
  4. Listen to the drain pump
    Start a drain cycle and listen at the bottom front of the washer. If the pump hums or buzzes but no water leaves, the pump is likely jammed or failed and will need replacement by a technician.

When to call a technician

Stop and call a qualified technician if any of these apply:
  • The pump hums or buzzes but moves no water
  • The filter and hose are clear but F21 keeps returning
  • You smell burning or see damaged wiring near the pump
  • The drain pump needs replacement

Frequently asked questions

What is the difference between F21 and SUD?

F21 means the washer could not drain in time. SUD means it detected too many suds. Heavy suds can slow draining, so the two codes sometimes appear together. Fix the suds first, then recheck the drain.

Where is the drain pump filter on a Kenmore front-load washer?

Behind the lower front access panel, near the bottom. Unscrew the round filter cap to reach it. Have towels ready because water will come out.

How often should I clean the drain filter?

Every few months, or right away if you see F21. Small items like coins and hairpins collect there and slowly choke the pump.

Sources

Every meaning and fix above was checked against official manufacturer documentation:

FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.

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