Freezer making loud humming or buzzing noise from compressor area.

Safety first: Unplug the freezer before touching the compressor or pipework.

Steps:

• Remove the rear lower panel and listen/feel for the source of noise when briefly powered (only if safe and necessary).
• Check that copper refrigerant pipes are not touching each other or the cabinet; gently bend them apart slightly if they are.
• Inspect the rubber compressor mounts; replace if perished or missing.
• If fitted, check the condenser fan for worn bearings or blades hitting the shroud; replace the fan motor if noisy.

Note: A loud internal knocking or grinding from the compressor itself usually indicates internal mechanical failure and requires compressor replacement by a professional.