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. 4 T8 h( y" q3 M$ f. c' l9 K3 o' a) V 4 \' A/ P6 E6 k9 O+ ?8 x( r( K1 JSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. O9 N$ W8 l/ o: { # r# a/ x) U5 c: L; r! C9 }* L- s4 a) {8 @3 X# U: ^7 s2 y) T
Otherwise, find a professional or change a new set.