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. 5 Y# p- y' `: q% K. B
/ o6 B7 B6 \( ~( J" ?/ M' J9 uSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. % u! D% ~1 a4 k& ^3 J3 t 6 F& K: Y' w$ S+ ?% w9 Y, ]3 l' K* G4 C
Otherwise, find a professional or change a new set.