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. 4 a4 z: L% `* e9 a
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. / A0 ?0 u$ J: ?/ C+ C5 D% s6 M5 V/ f) ^0 V7 \ W! u
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Otherwise, find a professional or change a new set.