Loud knocking or rattling noise from inside the cabinet when the fan runs.

Safety first: Unplug the cooler before removing interior panels.

• Check shelves and bottles: Rearrange bottles so they do not touch the rear wall or each other tightly. Ensure shelves are fully seated.
• Access evaporator fan: Remove the interior rear panel to expose the fan and evaporator.
• Inspect for ice: Look for ice buildup around the fan. If present, defrost the unit completely and check the defrost system.
• Tighten components: Tighten any loose screws on the fan shroud and evaporator cover. Ensure wiring is secured away from the fan blades.