Rheem outdoor unit is very loud during operation, with rattling or buzzing noises.

Safety first: Turn off power at the disconnect before inspecting the outdoor unit.

• Check for debris: Look through the top grille for sticks, rocks, or other objects contacting the fan blade. Remove any obstructions.
• Tighten hardware: Remove the top panel and tighten fan motor mounting bolts and any loose sheet metal screws.
• Inspect fan blade: Ensure the blade is not cracked or bent. Replace if damaged.
• Compressor mounts: Check that the compressor mounting bolts and rubber isolators are intact. Replace worn isolators to reduce vibration.

Warning: Do not run the unit with the top grille removed; this is unsafe and can damage the fan.