Cooktop shows 'L' and will not respond to power level changes

User steps:

• Refer to the Liebherr user manual for your model. Typically, press and hold the lock key (often a key symbol) for 3–5 seconds until the 'L' disappears.
• Ensure the control area is clean and dry; moisture can interfere with touch recognition.
• If the lock will not clear, power-cycle the cooktop at the breaker for 2–3 minutes and try again.

If the lock indicator remains stuck despite correct procedure, the touch control board may be faulty and should be checked by a technician.