Zanussi Dishwasher Error I20

⚡ Quick Answer: The Zanussi Dishwasher I20 error code indicates a drainage malfunction, typically resulting in water remaining in the tub or failure to drain properly... ✅ DIY Fixable

What Does Error I20 Mean?

The Zanussi Dishwasher I20 error code indicates a drainage malfunction, typically resulting in water remaining in the tub or failure to drain properly. This issue may be accompanied by unusual noises during operation. Common causes include clogged internal filters or a blocked drain hose.

Common Symptoms:

  • Dishwasher stops mid‑cycle with water still in the bottom of the tub.
  • Error code I20 displayed on control panel (or two beeps/two flashes on models without a display).
  • Water not draining or slow draining.

Possible Causes

  • Clogged internal filters or sump area (high)

How to Fix Error I20

DIY Fix Clear filters and check basic drainage

  1. Turn off the dishwasher and disconnect from power.
  2. Remove and clean the coarse and fine filters from the bottom of the dishwasher.
  3. Check and remove any debris in the sump area and visible drainage inlet.
  4. Restart the dishwasher to see if the code clears.

DIY Fix Inspect and correct drain hose installation

  1. Ensure the drain hose is not kinked, twisted, or crushed.
  2. Verify that the drain hose is installed at correct height and routing per manufacturer guidelines.
  3. Clear any visible blockages in the hose or at the connection to the sink trap.

Technician Only Inspect and service drain pump or internal components

  1. Access the drain pump and inspect for internal obstructions or damaged impeller.
  2. Test drain pump electrical operation.
  3. Replace drain pump if found defective.
  4. Check pressure switch and pressure tube for blockages if drainage issues persist.

Parts needed: Drain pump assembly, Pressure switch / tube

🛑 When to Call a Pro:
  • If the dishwasher continues to display I20 after clearing filters and hoses.
  • If drain pump inspection reveals electrical failure or broken components.
  • If internal diagnostic checks (pressure switch, sump flow) indicate faults inaccessible to typical users.

Next step

Choose the next step for I20

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

Most relevant component to inspect

Drain Pump

Pumps waste water out of the appliance during the drain cycle.

Typical part-only price
$35 - $80
DIY difficulty
Easy
Estimated time
15-30 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Also check
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Other parts options

Check related components first; use model search as a fallback.

Possible related component

Pressure Switch

Detects the water level inside the tub and signals when to start or stop filling.

$25 - $65 · Easy · 15-30 mins

Check fit & price
Model number required

Model-compatible Dishwasher parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

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Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Dishwasher Cleaner and Descaler

Supports routine removal of mineral scale, grease, and odor. It is maintenance, not a repair for a failed pump, valve, or control.

View maintenance supply
Maintenance supply

Braided Dishwasher Inlet Hose

For replacement of an externally damaged supply hose. Verify connection size, length, and appliance installation requirements before ordering.

View maintenance supply

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Technical Specifications

note The previous model-independent part specification was removed. Verify the full model number and diagnosis in the manufacturer's official parts catalog before ordering.
part_number None

Common Questions

What does I20 error mean on Zanussi Dishwasher?

The I20 error indicates a drainage malfunction, often with water left in the tub.

Can I fix Zanussi Dishwasher I20 error myself?

Yes, you can clear filters and check the drain hose for blockages.

How much does it cost to fix I20 error?

Repair costs typically range from ¥10,000 to ¥30,000 depending on the model and region.

When should I call a technician for I20?

Call a technician if the error persists after cleaning or if drain pump issues are suspected.

Sources & References

Data last verified: 2026-07-31

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