Microwave makes rattling, grinding, or scraping noises during operation.

Safety first: Unplug the microwave before internal inspection.

User-level checks:

• Remove the glass tray and roller ring; clean both and the cavity floor.
• Inspect the roller ring wheels for flat spots or damage; replace if worn.
• Run the microwave briefly (with a cup of water) without the glass tray to see if the noise changes.

If noise persists:

• The cavity or cooling fan may have debris or worn bearings. This requires removal of the outer cover and should be done by a technician.