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. : u) q: `3 z) D+ U+ e* g+ T" e; Q' K1 }3 G# u3 ]
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking., X( Z% v$ W2 V; X8 F {" ~6 z2 C
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Otherwise, find a professional or change a new set.