Freezer makes loud humming or buzzing noise from the back, especially when starting.

Safety warning: Unplug the freezer before removing the rear panel. Moving parts and high voltage are present.

Steps to reduce humming/buzzing:

• Identify noise source: Listen carefully at the back with the panel on to determine if the noise is from the compressor (low, deep hum) or fan (higher-pitched whir/buzz).
• Access rear compartment: Unplug the unit and remove the rear lower panel.
• Check condenser fan: Inspect the fan blade for cracks, looseness, or contact with wiring or shrouds. Tighten the blade on the motor shaft and reposition wires away from the blade.
• Spin fan by hand: It should rotate freely without grinding. If stiff or noisy, replace the Costway condenser fan motor.
• Compressor noise: If the compressor itself is very loud or rattling, ensure its mounting bolts and rubber grommets are intact and tight. Replace worn grommets to reduce vibration.

Note: A compressor that is excessively loud and hot may be failing internally and should be evaluated by a professional.