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. 7 T1 ^, p& X/ z j' v @ 3 C2 ], h- ?6 [) E+ nSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.# b! U) N- J$ a: V9 Z- `9 t
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Otherwise, find a professional or change a new set.