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. % L5 S9 a4 A2 W0 P; w
' W% o R" u7 U3 M, PSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. 7 x; i! G2 w- M% K 7 M5 h) l2 r. @! R- U Q: _( a1 Q/ c" ~( L. O
Otherwise, find a professional or change a new set.