Lennox outdoor unit is excessively noisy during operation, with rattling, vibrating, or metallic banging sounds.

Safety: Turn off power at the disconnect before touching the unit. Moving fan blades can cause serious injury.

• 1. Inspect fan blade: Check for bent blades or loose set screws on the motor shaft. Tighten or replace as needed.
• 2. Remove debris: Clear sticks, rocks, or other objects from the base pan and around the fan.
• 3. Tighten hardware: Tighten all accessible screws on cabinet panels, fan guard, and compressor mounting bolts.
• 4. Level the unit: Ensure the Lennox condenser is level on its pad. Shim or re-level if it has settled and is tilting.

Note: Persistent loud banging from inside the compressor indicates internal damage and requires professional evaluation.