The answer to 'why is my ductless system leaking water' is that a ductless mini-split system can leak water for several common reasons. The most likely causes are a clogged drain line, a refrigerant leak, or a problem with the condensate pump or drain pan. Leaks can lead to water damage and mold growth if not addressed promptly.
If you notice water leaking from your ductless unit, first check the drain line to make sure it is not clogged with dirt or debris. You may be able to clear the line yourself using a wet/dry shop vacuum. If the drain line appears clear, the issue could be a refrigerant leak or a problem with the condensate pump. These issues require professional diagnosis and repair, so it's best to call an HVAC technician to inspect the system and make any necessary repairs.