Microwave makes loud buzzing, grinding, or humming noises during operation, louder than normal fan noise.

Safety first: Unplug the Café microwave before inspecting the interior.

Steps to try:

• Isolate noise source: Run the microwave briefly with a cup of water and listen carefully. Noise from the bottom center often indicates turntable motor; from the side or top may indicate fan or magnetron.
• Check turntable components: Remove the glass tray and roller ring. Clean and inspect for cracks or foreign objects. Run a short cycle without the tray to see if the noise changes.
• Inspect fan area: Look through the top or rear vents for any loose pieces of packaging or debris contacting the fan.
• If noise persists or smells burnt: Stop using the microwave and schedule service. A technician should inspect the magnetron, fan motor, and turntable motor.