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. : ]& L. R. _" x4 ?7 O4 E% P% k
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. ! z) l7 U/ V( l0 H* x( a5 n$ n1 `7 U2 u4 V. N
^7 K( O8 z& T: b) \4 H; uOtherwise, find a professional or change a new set.