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 fan, or an issue with the electrical components. Symptoms may include the system not turning on, poor airflow, or warm air coming from the vents.
To troubleshoot, first check that the system is receiving power and the thermostat is set correctly. If the issue persists, it's best to call in a professional HVAC technician, as ductless systems require specialized expertise to diagnose and repair. Attempting DIY repairs on a ductless system can be dangerous and may void the warranty.