MHI · Air Conditioning
You hear a hissing or clicking sound from the unit. This sound is caused by the normal operation of the refrigerant control valves or other electric components within the air conditioner.
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This is a normal operational sound and does not indicate a fault.
No action is typically required for this sound.
Ensure all covers on the indoor and outdoor units are properly closed and secured.
If the sound is accompanied by a loss of performance, contact your dealer.
Do not attempt to open the unit to investigate these sounds.