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 Z( k& r3 {: a& s/ z" c/ Q, Y9 ~# y % [8 l6 B6 X( ? e" X0 t) RSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.6 F9 ]1 X- k; K, c5 T' B7 M
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Otherwise, find a professional or change a new set.