Oven display shows F18 and the appliance may shut down unexpectedly during long cooking cycles.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Turn off power and allow the oven to cool completely.
Ventilation and fan checks:
- Ensure that the installation cut-out and ventilation clearances match Liebherr specifications; remove any obstructions from vents.
- Access the top of the oven and locate the electronics cooling fan (if separate from cavity cooling fan).
- Check that the fan spins freely and is not clogged with dust; clean carefully.
- Test the fan motor for continuity and replace if open or noisy.
If the fan is operational and ventilation is adequate but F18 persists, the temperature sensor on the control board or the board itself may be defective and should be replaced by a technician.
Repair Difficulty
Required Part
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