It is possible that the shut-off valve was blocked by the cumulated white stuff. As a result, water supply can not be stopped even when water level is high. # c) Z; l; Q2 b, ]/ _1 s& Y+ K5 a9 X
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. - d, c0 Q7 A8 L5 e* Y5 @" Q! a) w& b& ^$ f2 `: o
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Otherwise, find a professional or change a new set.