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

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

Steps to reduce knocking:

• 1. Access rear compartment: Remove the rear panel to expose the compressor and tubing.
• 2. Inspect tubing: Look for copper lines that are touching each other or the cabinet. Gently bend them away to create clearance, using both hands to avoid kinking.
• 3. Check compressor mounts: Ensure rubber grommets under the compressor are intact and that mounting bolts are snug but not overtightened.
• 4. Level the freezer: Use a level to ensure the unit is not tilted excessively, which can increase vibration.

When to call a technician: If knocking persists and seems to come from inside the compressor, internal mechanical failure may be developing and requires professional evaluation.