A3 alarm or code, rapid temperature fluctuations, appliance may run loudly or continuously.

Safety first: Disconnect power before removing switch components.

Step-by-step checks:

• 1. Confirm door closure: Ensure nothing is obstructing the door. Check shelves and tall containers.
• 2. Test door switch: Locate the door switch (usually in the frame). Press it in and listen for interior light turning off or a click. If no change, the switch may be faulty.
• 3. Inspect hinge and alignment: Check that the door is level and aligned with the cabinet. Adjust hinge screws if the door is sagging.
• 4. Replace switch if needed: Remove the switch, disconnect the wires, and install a new Indesit-compatible door switch.

When to call a technician: If the switch is good but the alarm persists, the control board input may be faulty.