Ariston Dishwasher Error A03

⚡ Quick Answer: The A03 error code on your Ariston dishwasher signifies a drainage problem, often leading to water not being expelled correctly. Symptoms include the ... ✅ DIY Fixable

What Does Error A03 Mean?

The A03 error code on your Ariston dishwasher signifies a drainage problem, often leading to water not being expelled correctly. Symptoms include the dishwasher stopping mid-cycle, water pooling at the bottom, and the drain pump running without effectively removing water. This issue can stem from a blockage in the drainage system or a failure in the thermistor or drain timeout circuit. Addressing this promptly is crucial to prevent further complications.

Common Symptoms:

  • Dishwasher stops mid‑cycle
  • Water remains in the bottom after cycle
  • Drain pump runs without expelling water
  • Error code displayed immediately after or during drain phase

Possible Causes

  • Drainage blockage or water not draining (medium)
  • Thermistor short or drain timeout circuit fault (low)

How to Fix Error A03

DIY Fix Check and clear simple drainage blockages

  1. Stop the dishwasher and disconnect power
  2. Open the dishwasher and remove the bottom basket
  3. Inspect the filter and remove debris
  4. Check the drain hose for kinks or visible blockages
  5. Reassemble and run a short drain rinse cycle

Technician Only Inspect drain pump assembly and electrical components

  1. Disconnect power and remove access panels
  2. Test drain pump motor for operation and continuity
  3. Inspect and test water level/pressure sensors and thermistor circuits
  4. Check wiring harness and connectors for shorts or damage
  5. Replace defective pump or sensor components as needed

Parts needed: drain pump, filter assembly, thermistor / level sensor, drain hose

🛑 When to Call a Pro:
  • If internal water remains after clearing visible blockages
  • If electrical tests show short circuits or failed sensors
  • If drain pump fails to run despite being supplied with power

Technical Specifications

wattage 30W
component Drain Pump
resistance 10-20 ohms
part_number C00195256
voltage_rating 230V AC

Common Questions

What does A03 error mean on ariston dishwasher?

The A03 error indicates a drainage issue, where water is not being expelled properly.

Can I fix ariston dishwasher A03 error myself?

Yes, you can check for simple blockages by inspecting the filter and drain area.

How much does it cost to fix A03 error?

Estimated repair costs range from $80 to $250 depending on the issue.

When should I call a technician for A03?

Call a technician if water remains after clearing blockages or if the drain pump doesn't operate.

Sources & References

Data last verified: 2026-04-14

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