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. # z- b; r1 p, d: e5 w
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.! F/ ?7 K9 w8 {5 g) u2 H
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Otherwise, find a professional or change a new set.