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. : ~" N6 w% i1 v) d8 V4 L* ^4 F0 o
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. ; R8 U5 e$ \1 x+ \7 P3 G- e# g. {' v }. `9 C: Z. w P
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Otherwise, find a professional or change a new set.