Microwave interior light does not come on, but unit heats and operates normally.

Safety first: Unplug the microwave before any lamp replacement.

User-level guidance:

• On many Proline models, the cavity lamp is not user-accessible and requires cabinet removal.
• If the manual indicates a user-replaceable bulb, follow the instructions to access the lamp cover, remove the old bulb, and install an identical microwave-rated replacement.
• If access is not described in the manual, have a technician replace the lamp to avoid exposure to high-voltage components.