The answer to 'mini split blowing hot air' is that there are several common causes, including a refrigerant leak, a problem with the reversing valve, or an issue with the thermostat or control board. Symptoms may include the unit blowing hot air instead of cool air, the compressor running constantly, and the unit not cooling effectively.
Some potential solutions include checking the refrigerant level, inspecting the reversing valve, and troubleshooting the thermostat or control board. However, many of these issues require the expertise of a professional HVAC technician, so it's generally best to call for service rather than attempting DIY repairs.