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. 8 Y: n& i) p: x k" l6 P
7 q/ X" s; n2 T: ^% E1 l0 s+ n5 wSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking." J7 n- x) ?- c* K
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Otherwise, find a professional or change a new set.