Freezer makes loud humming, buzzing, or clicking noises from the rear.

Safety: Unplug the freezer before touching any components in the compressor compartment.

Steps:

• Identify noise source: Remove the rear lower panel and listen carefully (with the unit briefly powered if necessary). Determine whether the noise comes from the compressor, fan, or vibrating tubing.
• Check condenser fan: Inspect the fan blade for cracks or looseness on the motor shaft. Tighten or replace the blade if it wobbles. Remove any debris contacting the blades.
• Secure tubing: Look for copper lines touching each other or the cabinet. Use foam sleeves or zip ties to gently separate and secure them.
• Evaluate compressor sounds: A steady low hum is normal. Loud metallic knocking, grinding, or repeated clicking from the relay area suggests compressor or relay issues. Test and replace the start relay and overload as described earlier.
• Reinstall panel: Ensure the rear panel is firmly secured; a loose panel can also rattle.

When to call a technician: If the compressor itself is internally noisy or knocking, it may be failing and will require professional replacement.