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. ; Q& C2 i' L7 o" G4 n+ C+ k) m1 ?. y: R c9 `# D! o; M1 J
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.+ T& \% b' `" |* a
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Otherwise, find a professional or change a new set.