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. 0 I7 ?& ^) w, i7 t
# C! `! q$ v# ]! h1 K7 f/ n9 C1 L, GSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. " F* R% B ~+ {% c' R) Z6 u% a# Q$ h4 @( u, j. M
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Otherwise, find a professional or change a new set.