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' K0 Z% M5 W : ?: Q4 B% X$ v5 g3 _- R, vSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.7 {! y7 y/ |2 g! C. H1 A
0 R- H" z8 `4 K4 [. ~# Q1 K* p " ?: ?: X& D$ vOtherwise, find a professional or change a new set.