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. 2 g4 L3 }: F- n7 h1 ~: R l
# X, [. N% X# G0 o( z' v: k+ ESolution: turn off water supply and take the humidifier apart and clean it will stop the leaking., S+ a! U4 }( |; y, P
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Otherwise, find a professional or change a new set.