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. * c$ z% q, B3 t3 Q0 E4 j8 w3 |" e' Y2 @/ z# {
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.* P" u. B! e, m" ?. A9 g+ j
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9 n( {. H: D% d9 v" {Otherwise, find a professional or change a new set.