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 O( y$ A4 [0 t4 K: N
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. 2 Q6 R5 U* `0 S; R" N; a0 k/ v5 E; v9 \" ?
) h$ e9 a( o; m& QOtherwise, find a professional or change a new set.