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. 2 K& v& Z F4 q, }" o3 @/ j' g, ~
" @) h! ?: F5 [+ j8 n( USolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.5 _- k6 T1 z, m- ~1 R
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Otherwise, find a professional or change a new set.