The answer to 'mini split not heating' is that there are several common causes, including a refrigerant leak, a problem with the compressor, or an issue with the thermostat or control board. Symptoms may include the indoor unit not blowing warm air, the outdoor unit not running, or the system cycling on and off frequently.
In many cases, troubleshooting and repairing a mini split system that is not heating properly requires the expertise of a professional HVAC technician. They have the specialized tools and knowledge to diagnose the root cause and make the necessary repairs. Attempting DIY repairs on a mini split system can be dangerous and may cause further damage if not done correctly.