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. 7 R/ E! D1 f: N0 G. S5 e 6 b7 _ n) N( a2 B# `: mSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. ' Q n9 \% q% C' u6 z! X, @- n$ `, b7 P% m
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Otherwise, find a professional or change a new set.