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. 1 g. U& ^, M, z6 s( @* \; n9 g% F. c2 y& P' D9 c
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.- L% h/ n9 H1 i/ ?% `. T; I
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Otherwise, find a professional or change a new set.