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. ! _1 i& s/ i$ d/ J% h; X! k' { L# u* b
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.% V' }2 |4 F7 N$ M( F
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Otherwise, find a professional or change a new set.