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. $ }8 k, x$ ?. D2 E, S, x* v" I3 D! J! T/ Y; W6 m8 e, Z
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.9 E! S) \4 f, s: ?2 S
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) Z' {! a6 y! X" DOtherwise, find a professional or change a new set.