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. - M0 a! y2 t# _1 Y7 t& j$ X/ m( b" p; V7 P2 Q& h4 l# s
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.+ D) } j: a8 @
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$ M, I/ P6 [: q# O8 p5 T2 C' x KOtherwise, find a professional or change a new set.