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. , ]; x/ Z5 }: I9 u* L
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. * f2 x" D" I7 L5 o* d& r: i) [) Z. I7 a# z
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Otherwise, find a professional or change a new set.