Hansa oven shows E10 and the interior light does not work; other functions may be normal.

Safety first: Switch off power and allow the oven to cool before changing the bulb.

• Replace the bulb: Remove the glass lamp cover inside the oven (usually twists off). Replace the bulb with the correct high-temperature oven lamp specified by Hansa (same wattage and base type). Do not use a standard household bulb.
• Inspect the lamp holder: Check the ceramic socket for cracks, burning, or loose contacts. Replace the lamp holder if damaged.
• Check wiring: From the rear, inspect the lamp wiring harness for breaks or heat damage. Repair or replace as needed.
• Control board output: If the bulb and holder are good but the lamp never receives voltage, the control board's lamp driver may be faulty and require replacement.

When to call a technician: If replacing the bulb and inspecting the holder does not restore operation, further electrical diagnosis is needed.