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. + K* p H6 q+ F: B' Q
" Y9 Q/ L- U* f. i: c( _( {Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. 4 O6 k8 R" S: V! S {: P7 y, h y! i
( `2 }0 r7 b9 T xOtherwise, find a professional or change a new set.