My Mitsubishi mini-split has a clogged drain. How can I clean it?

Cleaning a clogged drain on a Mitsubishi mini-split involves safely accessing the indoor unit and clearing out accumulated algae, dust, and slime buildup that obstructs normal water flow. First, disconnect power to the system at the breaker to ensure safety. Next, remove the front cover and air filters of the indoor air handler to expose the plastic condensate tray located underneath the coils. Pour a small mixture of warm water and mild dish soap or a specialized condensate pan treatment down the drain trough, letting it sit briefly to loosen debris. If the clog is severe, you can use a wet-dry shop vacuum on the outdoor end of the drain pipe to gently suction out the blockage, or push a flexible nylon brush or compressed air through the line from the inside. Once cleared, test the system by pouring a cup of clean water into the pan to ensure it drains smoothly outside before reassembling the unit.