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. 4 r; x; }- B) a- } b# n$ B
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.9 L% R! p( v' J3 e; z! P: u
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9 A4 g( n" |! r5 M) x( H# e" t9 tOtherwise, find a professional or change a new set.