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. ' M9 Y4 K2 E O" r2 k9 G4 Q( Q
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. T& w- `2 Z7 n( k+ T; B/ g3 {* C: O) V4 u
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Otherwise, find a professional or change a new set.