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 ] a5 c9 q8 U' y4 s
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.% o: f- \( z+ v% v, {
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Otherwise, find a professional or change a new set.