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. ' t/ \4 k/ c+ j
$ F: }% s8 S% V7 pSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. & w5 _: a& u$ t9 x9 x7 {% Y2 @9 C G7 n6 v: v; G% R3 G
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Otherwise, find a professional or change a new set.