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. & {0 k- r8 r& s" w+ J
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. ! N$ ~8 _. T4 \ {' W# O/ P ; D% Y6 i9 e8 k D6 U* j. P: f: n4 E. y/ Z" U' a0 J+ p
Otherwise, find a professional or change a new set.