Microwave produces a rattling or vibration noise, especially when the fan is running.

Safety: Unplug the microwave before touching internal parts.

User-level steps:

• Check inside: Remove the glass tray and roller ring; clean and reseat them properly.
• External items: Remove any items stored on top of the microwave that may vibrate.

Technician-level steps:

• Inspect the cooling fan and vent fan housings for loose screws.
• Check internal metal panels and brackets for looseness and tighten as needed.
• Remove any foreign objects from the blower or cavity.