Rattling or knocking noise when the compressor starts or stops.

Safety: Unplug the refrigerator before bending any tubing or tightening components.

Steps:

• 1. Check external items: Remove objects from the top of the refrigerator that may rattle.
• 2. Inspect rear tubing: At the back, gently move refrigerant lines away from each other and from the cabinet using your hand. Add foam sleeves or clips where lines touch.
• 3. Secure condenser: Ensure the condenser coil is firmly mounted and not loose in its brackets.
• 4. Internal panels: Inside the fridge and freezer, press on shelves and panels to identify any that rattle. Tighten screws or add small pads where needed.

Note: Do not kink or sharply bend refrigerant lines; this can cause leaks and permanent damage.