The answer to 'ductless system not heating' is that a ductless mini-split system not providing adequate heating can be caused by a few common issues. This could be due to a refrigerant leak, a problem with the compressor or indoor unit, or issues with the thermostat or electrical components.
Some common symptoms include the system not turning on, blowing cold air, or not reaching the set temperature. Solutions can range from simple DIY fixes like checking the thermostat settings or cleaning the air filters, to more complex issues that require a professional HVAC technician to diagnose and repair, such as a refrigerant leak or compressor failure.