Microwave makes loud buzzing, humming, or grinding noises during operation.

Safety first: Unplug the microwave. Unusual noises can indicate serious internal faults.

Step-by-step checks:

• 1. Isolate source: Remove the glass tray and roller ring, then run a brief test. If the noise disappears, the issue is with the turntable components.
• 2. Check turntable parts: Inspect the roller ring, coupler, and tray for damage or misalignment.
• 3. Listen for fan noise: A rattling or scraping sound may come from the cooling fan. Debris or a bent blade can cause this.
• 4. Technician evaluation: A loud electrical hum or crackling can indicate magnetron or transformer problems. Have a technician inspect and replace faulty components.