Microwave interior light does not come on when door opens or during cooking, but unit otherwise works.

Safety first: Unplug the microwave and allow it to cool.

• Access lamp: On many Zanussi models, the lamp is accessible by removing the outer cover or a dedicated lamp cover.
• Inspect bulb: Check if the filament is broken or the bulb is blackened. Replace with the exact type and wattage specified by Zanussi.
• Check holder and wiring: Ensure the lamp holder is not burnt or loose. Reseat connectors.
• Test operation: Reassemble and test. If the new lamp does not light, the control board or door switch circuit may be faulty.