Safety first: Unplug the unit before tightening screws or removing panels. Keep fingers away from fan blades.

Step 1 – Identify noise source:
- Listen carefully to determine if noise comes from the front (indoor fan), rear (condenser fan), or base (compressor).
Step 2 – Tighten fasteners:
- Remove the outer cover and tighten any loose screws on fan housings, panels, and brackets.
Step 3 – Inspect fans:
- Check for foreign objects in the fan blades.
- Ensure blades are not rubbing against shrouds; adjust position if needed.
Step 4 – Check mounts:
- Inspect rubber grommets on the compressor and fan motors; replace worn Mounting Grommets to reduce vibration.

Excessive noise or rattling during operation

Possible Causes