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. 0 A e& S: }/ D7 _; [" O# y2 a/ Y
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. 2 v! r9 C. X8 V+ q7 J7 P& H1 \ 5 w- L" A, m" s: j- B. U+ l , |- z9 ?3 A' k& HOtherwise, find a professional or change a new set.