The answer to 'ductless system not cooling' is that there are several common causes, including low refrigerant levels, a malfunctioning compressor, clogged air filters, or a problem with the outdoor unit. Symptoms may include the unit not blowing cold air, warm air coming from the vents, or the system short-cycling. Solutions can range from simple DIY fixes like changing the air filter to more complex repairs that require a professional HVAC technician.
If the ductless system is not cooling properly, first check the air filter and clean or replace it if needed. You can also inspect the outdoor unit for any obstructions or debris that may be preventing airflow. However, if the issue persists or you suspect a more serious problem like a refrigerant leak or compressor failure, it's best to call in a licensed HVAC professional to properly diagnose and repair the system.