F12
Indesit
Communication error between user interface and main control board
Microwave shows F12 and none of the cooking functions can be selected; sometimes the oven light and fan still operate in test modes.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Loose or damaged communication harness, Faulty user interface PCB, Faulty main control PCB, Corroded connectors
How to Fix / Troubleshooting
Safety first: Disconnect from mains before removing the control panel.
- Step 1 – Power cycle: Unplug for 10 minutes, reconnect, and check if F12 clears. If it reappears, proceed to wiring checks.
- Step 2 – Inspect harness: Remove the control panel and locate the multi‑wire harness between the user interface board and the main PCB. Check for pinched, cut, or burnt wires.
- Step 3 – Reseat connectors: Disconnect and reconnect the harness plugs at both ends several times to clean the contacts. Ensure they latch securely.
- Step 4 – Check for moisture: Look for signs of steam or moisture damage around the control area. Dry gently if needed and improve ventilation around the oven.
- Step 5 – Replace faulty board: If wiring is intact and F12 persists, replace the user interface board first. If the fault remains, the main control board may also need replacement.
Note: Always match replacement boards to the exact Indesit model and version.
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Repair Difficulty
Hard
4/5
Required Part
User Interface Board
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