Hansa oven displays E09 and will not start; often associated with child lock or key symbol issues.

Safety first: Disconnect power before removing any panels.

• Clean the control panel: Wipe the touch area with a soft, slightly damp cloth and mild detergent. Dry thoroughly. Avoid excessive moisture around the edges.
• Check for stuck keys: On models with physical buttons, press each key several times to ensure it moves freely and returns. If a button feels stuck, the fascia or switch may need replacement.
• Reset child lock: Follow the user manual to disable the child lock (often by holding a specific key combination for several seconds). If E09 persists, proceed to hardware checks.
• Inspect UI board: Remove the control panel and inspect the keypad/touch board for signs of liquid damage or corrosion. Replace the UI board if damaged.

When to call a technician: If the error remains after cleaning and resetting, or if the keypad board needs replacement, professional service is advisable.