Refrigerator makes loud knocking or banging noises, especially when the compressor starts or stops.

Safety: Unplug the refrigerator before working at the rear. Beware of hot compressor surfaces.

Steps:

• Level the appliance: Adjust the front leveling feet so the refrigerator is stable and does not rock. A slight backward tilt helps doors close.
• Check compressor mounts: At the rear, gently try to move the compressor. Tighten any loose mounting bolts, but do not overtighten rubber grommets.
• Secure tubing: Identify any copper or aluminum lines that touch each other or the cabinet and vibrate. Insert foam or rubber spacers and secure with cable ties.
• Inspect condenser and fan: Ensure the condenser coil and fan shroud are firmly mounted and not rattling.