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

Safety first: Unplug the freezer before adjusting any tubing or mounts. Do not kink or crack refrigerant lines.

• Inspect tubing: Look for copper lines that are touching each other or the cabinet. Gently bend them apart slightly to create clearance, using both hands to avoid kinks.
• Check compressor mounts: Ensure rubber grommets and mounting bolts are intact and tight, but not overtightened.
• Allow settling: If the freezer was recently moved, allow it to sit upright for several hours before running to let oil settle in the compressor.
• Persistent internal knocking: If noise persists and clearly comes from inside the compressor shell, the compressor may be failing and requires professional replacement.