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. - k% R+ H9 v! }0 Y: ^
1 z1 S5 ~- I8 P N) ^- s9 ?$ \Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking." r, Q3 `" \, S) }
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Otherwise, find a professional or change a new set.