F12
Sharp
User interface communication or configuration error
Sharp oven shows F12 and may not respond to touch or rotary controls.
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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
Incorrectly seated user interface board, incompatible replacement control panel, damaged communication harness, firmware mismatch between UI and main board
How to Fix / Troubleshooting
Safety: Disconnect power before removing the control panel.
- Reseat UI board: Remove the front control panel and ensure the user interface PCB is firmly clipped in place and its connectors are fully seated.
- Check harness: Inspect the cable between the UI and main board for pin damage, bent pins, or broken wires.
- Confirm part numbers: If a control panel or board was recently replaced, verify that the Sharp part numbers are correct and compatible for your exact model.
- Factory reset: Some models allow a factory reset via a key combination (consult user or service manual). Perform this to clear configuration errors.
- Replace faulty board: If F12 persists, replace the user interface board first. If that does not resolve it, replace the main control board.
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Repair Difficulty
Hard
4/5
Required Part
User Interface Board
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