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. J, W7 T6 \! w; v" K 6 U6 ^. P: m- g8 USolution: turn off water supply and take the humidifier apart and clean it will stop the leaking./ q8 y# b1 _9 Z: \- s
# a' U/ S5 |8 E4 Q% g 1 g* L7 r4 E) i r4 [& D5 U Q) ]Otherwise, find a professional or change a new set.