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. 5 s3 S5 T: Z, H# U( e* k" r1 z4 x* n+ s( Y$ H3 N
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.9 D; D- K- W4 p- Z# H( U* r4 _2 M
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7 _6 v. D$ Y* C$ m; A; ? ?Otherwise, find a professional or change a new set.