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. & o8 g8 Y2 ?# o* I ( [# ~( z' S. F( @/ ^2 vSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. # e" ~) V- v8 K4 n9 F! V! ^) y D: W3 u1 h- v
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Otherwise, find a professional or change a new set.