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. 3 `; n/ O: S! A& ]( k * f0 \+ `1 }( e" d' h2 hSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. U: l6 n2 e5 H
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Otherwise, find a professional or change a new set.