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

Safety: Unplug the microwave. Lamps are often near live wiring.

• Access lamp: On many Bush models, the lamp is accessible by removing the outer cover or a small panel.
• Check bulb: Inspect the filament (if incandescent) or test continuity with a multimeter. Replace with the correct type and wattage specified for your model.
• Check holder and wiring: Ensure the lamp holder is not burnt and that wires are secure.

If a new lamp does not work, the control PCB’s lamp drive circuit may be faulty and require professional repair.