When your AC unit leaks water, it often indicates a blockage or malfunction within the system. Common causes include a clogged condensate drain line, preventing water from being expelled properly. A dirty air filter can restrict airflow, causing the coils to freeze and then drip water when they thaw. Additionally, a malfunctioning condensate pump or low refrigerant levels can lead to freezing over and subsequent leaking as ice melts. Addressing these issues promptly can prevent more severe damage to your AC unit.