How do I stop my split system from leaking water?

Stopping a water leak from a split or ductless mini-split air conditioning system requires addressing the underlying drainage restriction or installation flaw. First, turn off the AC unit at the electrical disconnect or circuit breaker. Second, open the indoor wall cassette and clean the washable mesh filters thoroughly. Third, inspect the internal condensate drain pan for cracks or blockages, and clear the flexible drain hose using a wet-dry vacuum or by pouring a diluted vinegar solution down the line to dissolve algae slime. Fourth, verify that the indoor unit is mounted level on the wall so that water flows naturally toward the drain outlet rather than pooling on the side. You can troubleshoot drainage easily. You can verify that the leakage has stopped completely when running the AC produces a steady flow of water outside without any indoor spills.