Loud rattling, buzzing, or grinding noise from the indoor unit during operation.

Safety first: Turn off the power before touching the unit.

• Step 1 – Check front panel: Ensure the front cover is fully closed and all screws are tight.
• Step 2 – Inspect blower: Open the front panel and look for objects stuck in the blower wheel. Remove carefully.
• Step 3 – Secure piping: Gently move the visible copper pipes to ensure they are not touching the plastic or metal housing. Use foam or tape to isolate if needed.

When to call a technician: Persistent grinding or motor noise indicates a failing fan motor that should be replaced.