Microwave makes a rattling, grinding, or scraping noise when the turntable rotates.

Safety: Unplug the microwave before reaching inside to inspect moving parts.

Steps:

• 1. Remove glass tray: Take out the glass turntable and roller ring. Clean both thoroughly.
• 2. Inspect roller ring: Check for flat spots, missing wheels, or cracks. Replace if damaged.
• 3. Clean cavity floor: Wipe the floor of the cavity where the roller ring sits. Remove any crumbs or hardened spills.
• 4. Check coupler: Inspect the turntable coupler for cracks or deformation. Ensure it sits firmly on the motor shaft.
• 5. Test without load: Run the microwave briefly (with a cup of water) and the glass tray removed to see if the noise comes from the motor itself.

Resolution: Replace the roller ring, glass tray, or coupler as needed. If the motor itself is noisy, replace the turntable motor.