The display shows the child lock symbol, and controls cannot be used.

Safety first: No internal work is usually required, but always disconnect power before removing panels.

• Disable child lock: Refer to the user manual. Commonly, press and hold a specific key (e.g., the lock symbol or Stop key) for 3–5 seconds until the lock icon disappears.
• Power cycle: If the lock will not clear, turn off power at the breaker for 5–10 minutes, then restore it and try again.
• Check for stuck keys: Inspect the control panel for any buttons that are physically stuck or continuously activated. Clean around the keys and ensure they move freely. If they feel loose or do not click, the user interface board may need replacement.
• Replace UI board: If the lock symbol remains and keys do not respond despite the correct procedure, the user interface board may be faulty and should be replaced.