Freezer makes loud buzzing or humming noise from the back; may click on and off; cooling may be poor.

Safety first: Unplug the freezer before touching the compressor or tubing. Components may be hot.

Steps:

• Identify noise source: Listen carefully at the back with the unit running to confirm the noise is from the compressor area.
• Inspect start relay: Remove the compressor terminal cover and check the start relay for rattling or burn marks. Replace if suspect.
• Check mounting: Ensure the compressor mounting bolts and rubber grommets are intact and not allowing excessive vibration. Replace worn compressor mounting grommets.
• Secure tubing: Look for copper lines touching each other or the cabinet. Gently bend or pad them with foam to prevent rattling.

When to call a technician: If the compressor itself is extremely loud and cooling is poor, it may be failing internally and will require professional replacement.