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. 8 L2 E- Z* m. d& e( h. Y; M
' v& Q4 S$ d4 p. z1 j. F& J# p0 Q" bSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.7 I- _! A* ]/ f% Y
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9 ^% x, I* R& K* u$ IOtherwise, find a professional or change a new set.