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 A9 v5 C2 {' O7 L
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. ) ~- f0 x3 O$ J ' H# u% }/ J2 Y6 k6 H( F% i/ `9 J9 W; s
Otherwise, find a professional or change a new set.