Single induction zone shows F5 and does not heat

Safety first: Disconnect the cooktop from mains power and verify with a meter that no voltage is present before opening the unit.

Preliminary checks:

• Confirm that other zones operate normally; if only one zone shows F5, the fault is likely localized.
• Allow the cooktop to cool fully before disassembly.

Technician procedure:

• Access the underside of the cooktop and locate the induction power module serving the affected zone.
• Inspect the module for burnt components or discoloration around the power transistors (IGBTs).
• Check the induction coil for continuity and correct resistance. An open coil indicates a failed cooking zone inductor.
• Verify all high-current connections are tight and free of corrosion.
• If the coil is intact, replace the zone power module following Liebherr service instructions.
• After replacement, perform a functional test on all zones and check for error codes.