Oven functions are locked out; display shows F5 and controls may be unresponsive.
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: Switch off power at the breaker for at least 5 minutes before attempting any reset.
- Hard reset: After 5–10 minutes with power off, restore power and observe if F5 clears. If it returns immediately, the fault is likely permanent.
- Check supply voltage: Verify that the range is supplied with correct voltage (e.g., 230 V single-phase or 400 V 3N depending on model). Overvoltage or missing neutral can damage the control.
- Inspect control board: Remove the control panel and visually inspect the main PCB for burnt components, bulging capacitors, or cracked solder joints.
- Connector check: Reseat all multi-pin connectors to the control board, ensuring firm contact.
- Replace control module: If F5 persists and no external wiring fault is found, replace the main electronic control module with the correct Kuppersbusch part number.
Note: Some models may require configuration or calibration after control replacement; refer to the service manual or use an authorized technician.
Repair Difficulty
Required Part
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