Finding water leaking indoors from your ductless mini-split wall cassette is a common issue typically caused by drainage obstructions or installation flaws. The primary culprit is a clogged condensate drain hose choked with thick algae slime, mold, or dust sludge that prevents moisture from escaping the internal drain pan, causing water to spill over into your room. Other frequent culprits include an improper wall-mounting angle where the unit tilts away from the drain hole, frozen evaporator coils caused by dirty air filters melting excess water, or uninsulated indoor refrigerant line sets sweating heavily. You can troubleshoot drainage lines easily. You can verify that the root cause is addressed when regular cleaning, flushing with vinegar, and leveling the unit keep all interior condensation contained and draining smoothly.
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