The answer to 'why is my ductless system leaking water' is that a ductless system can leak water for several common reasons. The most likely causes are a clogged condensate drain, a problem with the condensate pump, or a refrigerant leak. Leaks can also occur if the system is not properly installed or maintained.
If the leak is coming from the indoor unit, it's often due to a clogged drain line or an issue with the condensate pump. This can happen if the drain becomes blocked with dirt, dust, or debris. Refrigerant leaks are less common but can also cause water to drip from the indoor unit. Improper installation or a problem with the refrigerant lines may be the culprit.