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. * a2 |, z1 d* d/ C0 ?, o3 E
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.1 g$ ]$ a1 h$ T; ^% W2 x! R
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Otherwise, find a professional or change a new set.