The answer to 'why is my ductless system not working' is that there could be several common causes, such as a refrigerant leak, a problem with the compressor, or an issue with the electrical components. Symptoms may include the system not turning on, poor airflow, or uneven cooling in your home.
If your ductless system is not working, the first thing to check is the power supply. Make sure the circuit breaker has not tripped and that the system is getting electricity. You can also check the filters and clean them if they are dirty. However, if the problem persists, it's best to call a professional HVAC technician to diagnose and repair the issue. Attempting to service the system yourself could be dangerous and may void the warranty.