Main causes of noise:
Improper installation of the unit (vibrations from mounting brackets)
Worn or dirty fan
Compressor issues
Ice buildup or clogged drainage
How to identify the source:
Indoor unit: cracking or clicking sounds when turning on — possible fan blade issue
Outdoor unit: loud humming — possible compressor malfunction
What to do:
Check if any objects are touching the units
Clean the filters and ensure the drainage system is not blocked
If the noise persists, call a service technician for diagnostics
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