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. ! v% y9 J3 [7 F/ |" g' h
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. 0 h; Z8 [" s) S$ K) a5 a# d% P- t+ B. M4 Y
2 u8 _& I7 p9 w' m9 }' ^7 ^% cOtherwise, find a professional or change a new set.