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

Safety: Unplug the microwave before inspecting internal components.

Steps to address loud noise:

• 1. Isolate the source: Run the microwave briefly with a cup of water and listen carefully (from a safe distance) to identify whether the noise is from the bottom (turntable motor), back (transformer), or side (fan).
• 2. Check turntable system: Remove the glass tray and roller ring. Clean them and the cavity floor. Run the microwave briefly without the tray (with water load) to see if the noise changes. If quieter, the turntable motor or roller ring may be worn.
• 3. Inspect fan and vents: With the cabinet removed, check the cooling fan for debris or bent blades. Remove any obstructions.
• 4. High-voltage noise: A deep, loud hum often indicates a failing magnetron or transformer. Do not attempt to service these yourself; contact a technician.