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. ' n2 ]1 w& [) y, D% z ( @' B( L( G& ^- T$ H+ K% xSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.' j( c5 ~7 \0 c2 W) L
/ u! u0 j" C( c, L . r% X6 R! L2 n% N- ~* _5 i& U# COtherwise, find a professional or change a new set.