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
- Stop the dishwasher and disconnect power
- Open the dishwasher and remove the bottom basket
- Inspect the filter and remove debris
- Check the drain hose for kinks or visible blockages
- Reassemble and run a short drain rinse cycle
Technician Only Inspect drain pump assembly and electrical components
- Disconnect power and remove access panels
- Test drain pump motor for operation and continuity
- Inspect and test water level/pressure sensors and thermistor circuits
- Check wiring harness and connectors for shorts or damage
- Replace defective pump or sensor components as needed
Parts needed: drain pump, filter assembly, thermistor / level sensor, drain hose
- 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
Next step
Choose the next step for A03
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
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.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Dishwasher Filter
Screens food debris from recirculating wash water and protects the pump system.
Thermistor
Measures precise temperature changes and sends resistance feedback to the control board.
Drain Hose
Carries waste water from the drain pump to your home's standpipe or sink drain.
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.
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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.
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.
Braided Dishwasher Inlet Hose
For replacement of an externally damaged supply hose. Verify connection size, length, and appliance installation requirements before ordering.
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 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: 2026-07-31
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