The answer to 'ductless system blowing hot air' is that a ductless system blowing hot air is typically caused by a problem with the system's heat pump or refrigerant levels. This could be due to a refrigerant leak, a malfunctioning compressor, or an issue with the reversing valve that controls the flow of refrigerant. Symptoms may include the system not cooling effectively, the outdoor unit running constantly, and warm air blowing from the indoor unit.
In many cases, the solution may involve repairing or replacing the faulty component, such as the compressor or reversing valve. However, it's important to have a professional HVAC technician diagnose and address the issue, as improper handling of refrigerant or electrical components can be dangerous. Attempting to fix the problem yourself could also void the system's warranty.