F23 error on induction cooktop; one or more zones do not detect cookware properly.

Safety first: Disconnect power before opening the cooktop. Induction electronics are sensitive and high-voltage.

• Verify cookware: Use flat-bottom, ferromagnetic cookware (a magnet should stick firmly). Avoid warped or very small pans.
• Center the pan: Place the pan centrally on the marked zone and try different power levels.
• Inspect coil mounting: If internal access is possible, ensure the coil is firmly attached to the glass and not sagging away, which can affect detection.
• Check wiring: Inspect the sensor and coil wiring for damage or loose connectors.
• Replace power module: If cookware is correct and wiring is intact, the power module for that zone may be faulty and require replacement.