Freezer displays error code A5 and may run continuously or not start defrost cycles correctly.

Safety first: Disconnect mains power before removing panels or testing components. Risk of electric shock and sharp metal edges.

• Access the evaporator area: Remove drawers and the rear internal panel to expose the evaporator coil and defrost components.
• Check for heavy ice: If the evaporator is encased in solid ice, the defrost system is likely not working. Manually defrost by leaving the freezer unplugged with the door open and towels to catch water. Do not use sharp tools to chip ice.
• Inspect defrost heater: Look for a heater element attached to or beneath the evaporator. Check for visible breaks or burn marks. Test continuity with a multimeter; an open circuit indicates a failed heater.
• Check thermal fuse/thermostat: Many Ariston models use a thermal fuse or bimetal thermostat clipped to the evaporator. Test for continuity; replace if open at freezer temperatures.
• Replace faulty parts: Install an Ariston-compatible defrost heater or thermostat as needed. Ensure all clips and insulation are reinstalled correctly.

When to call a technician: If heater and sensors test good but A5 persists, the control board defrost circuit may be defective and requires professional service.