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. + d. ]7 l( } M2 r2 ]$ w) p9 n( u: _# j ?
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.. |7 ]( n% X3 U; I5 i
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/ G0 `' S' s; H7 z6 P+ YOtherwise, find a professional or change a new set.