Rattling or vibrating noise, especially when compressor starts or stops.

Safety first: No internal electrical work is required for basic vibration checks.

Leveling:

• Use a bubble level on top of the refrigerator.
• Adjust front leveling legs until the unit is stable and does not rock.

External sources:

• Remove items from the top of the refrigerator that may vibrate.
• Ensure the unit is not touching the wall or cabinets tightly; leave a small gap.

Internal checks:

• Remove the rear access panel and verify the drain pan and condenser coils are securely mounted.
• Tighten any loose screws on panels or brackets.