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. : M- C- C: M. \7 \! R; F5 j# h! P
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.+ b" c" y2 k' |3 f$ }/ W
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Otherwise, find a professional or change a new set.