Skip to main contentStart diagnosing F21 on your Whirlpool washer
What this code means
Long Drain - Water level does not change after the drain pump is on for 10 minutes.. Possible causes: Clogged drain hose; Clogged drain pump; Obstructed tub sump; Drain hose height too high; Pinched or leaking air hose; Pump not running
Next steps: diagnose the root cause
1
Verify the error code is active
Power cycle the unit and see if the code returns. If it does, the fault is persistent and requires diagnosis.
2
Get the full diagnostic procedure
Get step-by-step guidance, test values, and wiring diagrams from the OEM service manual.
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Access Whirlpool washer service manuals, wiring schematics, exploded parts views, and error code references on MyPros+.