Indoor unit makes loud rattling or buzzing noise during operation

Safety: Turn off power before tightening or adjusting components.

• Check panels and filters: Ensure the front cover is fully latched and filters are seated correctly.
• Tighten screws: Remove the cover and tighten all accessible mounting screws on the indoor chassis and brackets.
• Clean blower: Inspect the blower wheel for heavy dust buildup on one side; clean evenly to restore balance.
• Isolate pipes: If copper pipes are touching the casing, insert foam insulation or rubber spacers to prevent vibration transfer.