Loud rattling or vibrating noise from the indoor unit during operation

Safety first: Turn off power before tightening screws or touching moving parts.

• Check mounting: Gently push on the indoor unit. Excessive movement indicates loose mounting. Tighten wall bracket screws and ensure the unit is properly latched onto the bracket.
• Secure panels: Ensure the front panel is fully closed and all latches are engaged. Reinstall filters correctly.
• Clean blower: If accessible, clean dust from the blower wheel blades to restore balance.
• Pipe contact: Listen for vibration where refrigerant pipes pass through the wall. If they are touching the wall, add foam padding or insulation to prevent rattling.
• Persistent noise: If noise continues, the blower wheel or motor bearings may be worn and should be inspected by a technician.