Cooktop shows F7 and does not respond to touch inputs

Safety first: Ensure the cooking zones are off and cool before troubleshooting.

User steps:

• Check the user manual for the child lock deactivation sequence (commonly press and hold the key symbol or a specific combination for several seconds).
• Clean the control area thoroughly and dry it to ensure no moisture is triggering a false touch.
• Power-cycle the cooktop at the breaker for 2–3 minutes, then restore power and attempt to unlock again.

Technician steps:

• If the lock symbol remains and F7 persists, access the user interface board and inspect for damage or liquid ingress.
• Check the touch sensor pads on the underside of the glass for proper alignment and secure mounting.
• Test the interface board according to Liebherr diagnostics; if key signals are stuck or not registering, replace the touch control PCB.