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 ^7 e! K4 m Q* a8 p" f0 ~$ K# C
7 ^7 ]6 b& W6 c+ zSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.0 V( q+ D% X/ `+ \
# k" f4 _7 y) f9 G% L4 h- z 5 z& P- Q/ \6 I, a+ `" V: EOtherwise, find a professional or change a new set.