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. 8 G9 g) @9 o9 j; K# Z: ^* x
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.4 N/ j: z5 y" X
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Otherwise, find a professional or change a new set.