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. : z& _8 y4 Z4 y- ~: ^8 a9 l
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking." O* J$ V$ Z6 L$ U/ w" ^* `) I
1 L6 L2 P% B* B% A( Z1 R 5 e, c1 |$ ]' Z7 YOtherwise, find a professional or change a new set.