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. x6 l4 i/ \! F& Q . ~7 M) J! X2 l" ^* jSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. " }& _* B. U; [( X7 |& q4 v1 U. l6 h& P6 m9 ~3 {. R
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Otherwise, find a professional or change a new set.