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. / `) }; P8 V0 X& O8 S0 \. G" b! a' [: b
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. 8 P* g2 Z* Q2 y( x* y, H7 h6 M) G' c9 A* {
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Otherwise, find a professional or change a new set.