Microwave makes a rattling or vibrating noise during operation, especially at certain fan speeds.

Safety First: Unplug the microwave before tightening any screws or removing covers.

• Remove items from top: Take off any objects placed on top of the microwave that may rattle.
• Tighten mounting hardware: For over-the-range units, check the top and rear mounting bolts and brackets for tightness.
• Check outer cover: Ensure the outer metal cover is properly seated and all screws are tight.
• Inspect fan and ducts: If accessible, check that the fan housing and ductwork are secure and not contacting the cabinet.