F05
La Cornue
User Interface / Display Control Failure
Oven display is blank or frozen; buttons do not respond, but interior light may still work.
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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
Failed touch control panel, Faulty user interface (UI) board, Loose ribbon cable between UI and main control, Power surge damage to electronics
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before removing the control panel or front trim.
- 1. Power reset: Turn off the breaker for 5–10 minutes, then restore power. Sometimes the La Cornue control can recover from a minor software lockup.
- 2. Inspect control panel connections: Remove the front control panel or fascia according to the service instructions. Locate the ribbon cable or harness between the user interface and the main control board. Reseat the connectors firmly.
- 3. Check for moisture or corrosion: Look for signs of liquid ingress behind the control panel (from cleaning or spills). If present, allow the area to dry completely and clean any corrosion with appropriate electronics cleaner.
- 4. Test UI board: If the display remains blank but the oven light and other functions have power, the UI board or display module may have failed. Replacement of the user interface assembly is typically required.
- 5. Surge protection: After repair, consider using a surge protector rated for ranges to protect the La Cornue electronics from future power spikes.
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Repair Difficulty
Hard
4/5
Required Part
User Interface Control Panel
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