Oven or cooktop controls are locked; display shows LOC or a key symbol and buttons do not respond.

Safety first: No internal work is required for this condition; do not open the appliance.

• Unlock sequence: On most Kuppersbusch models, press and hold the key symbol or lock button for 3–5 seconds until the LOC indicator disappears. On some ovens, holding the Stop/Reset or a combination of + and - keys may be required; refer to the user manual.
• Power reset: If the lock will not clear, turn off power at the breaker for 1 minute, then restore and try the unlock sequence again.
• Check for stuck keys: If the lock symbol flickers or keys do not respond, inspect the touch panel for damage or heavy contamination and clean gently.

Note: If the control remains locked despite correct procedure, the touch panel or control board may be faulty and require service.