Unit is very noisy during operation; rattling, buzzing, or grinding sounds are heard.

Safety first: Unplug the unit before removing covers.

• Check installation surface: Place the unit on a solid, level floor. Avoid hollow or uneven surfaces that amplify vibration.
• Tighten panels: Inspect and tighten all accessible screws on the cabinet and handle. Add thin foam tape between rattling panels if needed.
• Inspect fan wheel: Access the blower and ensure it is firmly secured to the motor shaft. Tighten the set screw if loose.
• Check motor bearings: Spin the fan by hand; roughness or play indicates worn bearings. Replace the fan motor assembly.
• Compressor mounts: Verify that rubber grommets and mounting bolts are intact and snug, but not overtightened.