Microwave interior light does not turn on, but the unit heats and otherwise works normally.

Safety first: Unplug the microwave before replacing the bulb or accessing the light housing.

User-level steps:

• 1. Locate bulb access: Some Westinghouse models have an access panel on the side or top; others require removing the outer cover.
• 2. Replace bulb: Install a new microwave-rated bulb of the correct wattage and base type. Do not use a non-microwave bulb.

Advanced steps:

• 3. Inspect socket and wiring: Check for heat damage or loose connections at the socket.
• 4. Check control relay: If the bulb and wiring are good but the light never comes on, the control board relay may have failed and the board may need replacement.