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. * j# }0 x/ Z8 n9 D" u5 q: G. L0 F$ W1 y5 [0 p: R: ]
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.1 V. {3 |& H2 n% N" Z/ S7 m
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Otherwise, find a professional or change a new set.