Unit makes loud rattling or buzzing noises during operation.

Safety: Turn off and unplug the unit before inspecting moving parts.

Steps:

• Check for debris: Inspect indoor and outdoor fan areas for leaves, twigs, or foreign objects and remove them.
• Tighten screws: Tighten all accessible panel screws and mounting bolts on the fan motors and compressor base.
• Inspect fan blades: Ensure the outdoor fan blade is not bent and does not contact the shroud. Adjust or replace if damaged.
• Blower wheel: Check that the indoor blower wheel is centered and secured to the motor shaft. Tighten the set screw if loose.
• Compressor mounts: If the compressor vibrates excessively, inspect rubber mounting grommets and replace if deteriorated.