F6
Liebherr
Supply Voltage Out of Range
Cooktop displays F6 and may shut down unexpectedly during use
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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
Incorrect wiring (single-phase vs. three-phase), Low mains voltage, Loose terminal block connections, Faulty house circuit or breaker
How to Fix / Troubleshooting
Safety first: Switch off the cooktop at the main breaker. Only qualified personnel should open the terminal box or modify wiring.
User checks:
- Note when F6 occurs (e.g., when multiple appliances are running). This can help an electrician diagnose a supply issue.
- Do not continue using the cooktop if lights dim or breakers trip frequently.
Electrician/technician checks:
- Remove the terminal cover on the cooktop and verify wiring configuration matches the Liebherr installation diagram for the local mains (e.g., 230 V single-phase or 400 V three-phase).
- Check that all terminal screws are tight and that there are no signs of overheating or melted insulation.
- Measure supply voltage under load and confirm it is within Liebherr's specified range.
- If voltage is unstable or low, inspect the household circuit, breaker, and distribution panel.
- Correct any wiring errors and replace damaged terminal blocks if necessary.
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Repair Difficulty
Hard
4/5
Required Part
Terminal Block Assembly
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