Safety first: Switch off the cooktop and isolate from mains power. Do not attempt to operate with wet hands or a wet surface.

User steps:

Wipe the control area thoroughly with a dry, lint-free cloth to remove moisture, spills, or cleaning residues.
Remove any metal utensils, lids, or cloths from the control area.
Leave the cooktop powered off for 10–15 minutes to allow internal electronics to dry if there was a major spill.
Restore power and test the controls again.

Technician steps:

Remove the cooktop from the countertop and carefully separate the glass top from the chassis according to Liebherr service documentation.
Inspect the touch control PCB and ribbon cable for signs of liquid ingress or corrosion.
Clean minor corrosion with appropriate electronic contact cleaner and a soft brush.
Ensure the ribbon cable is fully seated and not damaged; replace if cracked or delaminated.
If F3 persists, replace the touch control panel assembly or main user interface board as specified for the model.

Cooktop displays F3 and will not allow power level selection on one or more zones

Possible Causes