The answer to 'why is my mini split not cooling' is that there are several common causes, including low refrigerant levels, a blocked air filter, or a problem with the compressor. Symptoms may include the unit not blowing cold air, the compressor not running, or the air flow being weak.
Some potential solutions include checking and replacing the air filter, adding more refrigerant if levels are low, or having a professional technician inspect the compressor and other components. It's generally best to call in an HVAC professional for diagnosis and repair, as mini split systems require specialized knowledge and tools.