Microwave interior light does not come on when the door is opened or during cooking, but the unit heats normally.

Safety first: Unplug the microwave before accessing the lamp.

• Locate lamp access: On many Ambiano microwaves, the lamp is accessible from the rear or side behind a small metal cover. Remove the screws and cover.
• Inspect bulb: Check if the filament is broken or the bulb is darkened. Replace with the same type and wattage specified for your model.
• Check socket and wiring: Ensure the bulb fits snugly in the socket and that wires are not loose or burned.
• Control issue: If a new bulb does not light but the microwave otherwise works, the lamp relay or control board may be faulty and require replacement.