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. ! x# `7 N, [" w8 r/ x- J 4 [3 n$ m' |3 \; m3 JSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.0 T, @1 |! ^3 ^/ x0 ?
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Otherwise, find a professional or change a new set.