The "Clean" or "Self-Clean" button found on many modern ductless mini-split handheld remote control units activates an automated maintenance cycle designed to dry out and sterilize the indoor evaporator coil. When selected, the indoor cassette runs the fan at a low speed for a specified period after cooling operation ceases, evaporating any lingering condensation and moisture trapped inside the coil fins. This prevents mold, mildew, and bacterial slime from proliferating in the damp dark interior, keeping indoor air fresh and preventing musty odors. You can troubleshoot maintenance schedules easily. You can verify that the clean function is working when running the cycle leaves the evaporator coil completely dry and eliminates damp, musty smells when you turn the mini-split on.
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