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Error code · Hoover

E21 · Uncontrolled water supply

Error E21 indicates an uncontrolled water supply due to an open solenoid valve. Immediately close the tap and disconnect the appliance from the power supply.

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Safe first steps

  1. Turn off the water supply by closing the tap immediately.
  2. Unplug the dishwasher from the power outlet to ensure safety.
  3. Inspect the solenoid valve for any visible damage or debris that may be causing it to remain open.
  4. If the solenoid valve appears damaged, contact a professional for replacement.

When to stop

  • If you cannot locate the solenoid valve or if it appears to be leaking, stop and call a professional.

Likely cause

Error E21 indicates an uncontrolled water supply due to an open solenoid valve. Immediately close the tap and disconnect the appliance from the power supply.

Verification

Reviewed by: automated manual extraction

Verified against Hoover HF 3C5L0X technical documentation

FixLens publishes its own structured technical logic verified against Hoover HF 3C5L0X documentation · last verified April 21, 2026.

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