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. ) r2 S* h7 b/ {0 l
+ d. ?: L1 m% oSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. . l' i U+ n& a5 k% [1 ~5 _ K4 E7 M9 K* K3 y& q& g$ Q
$ G0 O" }+ w1 Z7 b
Otherwise, find a professional or change a new set.