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. / C9 O' B$ z# N+ F5 k* j8 P- @2 Z* m5 w, G
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. 7 l! K. W; s/ F% o) b9 G3 Q2 g* x- B; o3 |' z3 q7 s6 l# ?
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Otherwise, find a professional or change a new set.