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. , H3 M9 E* L: m$ q
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.6 ^( ]4 v4 n1 L7 V$ \5 \9 D, Y
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Otherwise, find a professional or change a new set.