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. + y& ~/ ~0 z8 P( b; N) I- A { % |; C# f: s% E* U6 V% rSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.8 N; E# P8 R) |2 c
8 J3 K2 {8 y+ b$ b ! l) o. u9 ~. G+ A6 j: D3 `$ SOtherwise, find a professional or change a new set.