Zanussi Dishwasher Error I21

⚡ Quick Answer: The Zanussi Dishwasher error I21 indicates a malfunction in the drain pump, often characterized by slow or no drainage and standing water in the tub. ... ✅ DIY Fixable

What Does Error I21 Mean?

The Zanussi Dishwasher error I21 indicates a malfunction in the drain pump, often characterized by slow or no drainage and standing water in the tub. This issue typically stems from a partially blocked drain hose or filter, which may lead to unusual noises during operation. Resolving this problem often requires cleaning the external drain components.

Common Symptoms:

  • Dishwasher displays code I21
  • Water drains slowly or not at all
  • Standing water visible in dishwasher tub

Possible Causes

  • Drainage obstruction (partially blocked drain hose or filter) (medium)
  • Foreign object or non‑return valve issue in drain system (low)

How to Fix Error I21

DIY Fix Check and clean external drain components

  1. Turn off and unplug dishwasher.
  2. Remove and clean the dishwasher drain filter to clear debris.
  3. Check the sink trap and drain hose for kinks or visible blockages.
  4. Reattach everything and run a short rinse cycle to test drainage.

Technician Only Inspect and clear internal drain path and pump

  1. Disconnect dishwasher power and water supply.
  2. Remove access panel and locate drain pump and non‑return valve.
  3. Inspect and remove any obstructions within drain pump and non‑return valve.
  4. Check drain hose routing and flush with water if necessary.
  5. Reassemble and test operation.

Parts needed: Drain hose, Non‑return valve, Drain pump

🛑 When to Call a Pro:
  • If the dishwasher still fails to drain after cleaning filters and hoses
  • If unusual noises come from pump area
  • If water leakage occurs

Technical Specifications

wattage 30W
component Drain Pump
resistance 10-20 ohms
part_number Zanussi 1240000001
voltage_rating 230V AC

Common Questions

What does I21 error mean on Zanussi Dishwasher?

I21 error indicates a drainage malfunction, often due to a blocked drain hose or filter.

Can I fix Zanussi Dishwasher I21 error myself?

Yes, you can check and clean the drain filter and hose to resolve the issue.

How much does it cost to fix I21 error?

Repair costs range from $50 to $150, depending on the nature of the blockage.

When should I call a technician for I21?

Call a technician if the issue persists after cleaning or if you hear unusual noises.

Sources & References

Data last verified: 2026-03-18

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