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. ' x9 C3 S/ n9 K& H/ @) {( p+ u. G; y 0 `! d* y! f4 W+ ` i5 M3 lSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. ' f7 Q4 F4 p/ ?5 L 5 r6 t! T9 h' ~0 B, o0 [2 ]+ }' p0 c. [! z% R- n6 i
Otherwise, find a professional or change a new set.