Microwave beeps and displays F11 when attempting to start; sometimes accompanied by a brief relay click and immediate stop.

Critical safety warning: Inverter‑driven microwaves use high‑frequency high‑voltage circuits that are extremely dangerous. Only qualified technicians should work on the inverter module.

• Step 1 – Confirm model type: Check your Indesit model documentation to see if it uses an inverter instead of a traditional transformer. F11 is typically associated with inverter faults.
• Step 2 – Basic reset: Unplug the unit for 10–15 minutes, then reconnect and test. If F11 returns immediately, internal service is required.
• Step 3 – Visual inspection (no touching): With the cover removed and unit unplugged, visually inspect the inverter board for burnt components or cracked solder joints. Do not touch the board or components.
• Step 4 – Professional replacement: The usual remedy is replacement of the complete inverter module or, in some cases, the main control board as well. This must be done by an authorised Indesit service centre.

Recommendation: Do not attempt DIY repair on inverter modules due to the risk of electric shock and fire.