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. / n! `2 g% u0 v8 W2 L! z
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.# y3 @5 v( x! Y) m3 X! L4 g
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Otherwise, find a professional or change a new set.