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. S& R3 Q, [ ?" w4 G
( f/ p" p$ R+ p/ h' JSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.+ K: o9 _5 W: a4 h! t* _4 n' {
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Otherwise, find a professional or change a new set.