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. ' g# Y) E, ~2 s& a 5 U- y- O* b) @+ ~' Q* WSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.' z- `" S+ {$ Z- P" d1 q! W
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Otherwise, find a professional or change a new set.