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. : `" C2 e% p7 j' h9 ^' p/ B0 v2 h/ o3 T! {: B. w- e: c% B
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. ; h: x& _9 ~. n) w( X1 N( l T* ~% D* G& K* m% ^# ^% q$ v( G, b+ n
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Otherwise, find a professional or change a new set.