Smeg oven interior light does not work, but heating and fan are normal.

Safety first: Switch off power at the mains before changing the lamp to avoid electric shock.

• Replace bulb: Remove the glass lamp cover inside the oven (usually unscrews or clips off). Replace the bulb with a high-temperature oven lamp of the correct wattage and fitting (e.g., E14 25W) approved for Smeg ovens.
• Check lamp holder: If a new bulb does not work, inspect the lamp holder for corrosion or heat damage. Replace the holder if contacts are burnt or loose.
• Door switch: On some models, the lamp is controlled by the door switch. Test the switch for proper operation and replace if faulty.
• Control board: If the lamp is controlled electronically and all hardware is good, the lamp relay on the main control board may have failed and the board may need replacement.