The answer to 'ductless system blowing hot air' is that there are a few common causes for this issue, including a refrigerant leak, a problem with the compressor, or a malfunctioning reversing valve. Symptoms may include the system blowing hot air instead of cold, the compressor running constantly, and a lack of cooling throughout your home.
If your ductless system is blowing hot air, the first step is to check the air filters and clean or replace them if needed. You should also make sure the outdoor unit is not obstructed or covered in debris. If those basic troubleshooting steps don't resolve the issue, it's best to call in a professional HVAC technician to diagnose and repair the problem. Attempting to fix a ductless system on your own can be risky and may cause further damage if you don't have the proper training and equipment.