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. 6 W, A) n3 j, n/ ?4 ~
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.. D! Y2 w8 ~% F M7 q/ w3 m
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Otherwise, find a professional or change a new set.