Microwave displays F17 and the child lock cannot be disabled, or the keypad remains locked even after following the manual instructions.

Safety first: Although this is a low‑voltage issue, always unplug the microwave before removing the control panel.

• Step 1 – Try documented unlock sequence: Follow the Indesit user manual instructions (often pressing and holding a specific key or combination for several seconds) to toggle the child lock.
• Step 2 – Power reset: Unplug the unit for at least 30 minutes to fully discharge internal circuits, then reconnect and attempt to unlock again.
• Step 3 – Check for stuck keys: Press each keypad button firmly and ensure none are physically stuck or permanently depressed. Clean around the buttons with a soft cloth.
• Step 4 – Inspect keypad ribbon (advanced): Remove the control panel and check the keypad ribbon cable for damage or contamination. Reseat the connector.
• Step 5 – Replace keypad or control board: If F17 persists and the lock cannot be cleared, the keypad membrane or control board may be faulty and should be replaced with genuine Indesit parts.

Note: Firmware issues generally require full board replacement rather than reprogramming in the field.