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. 3 G) [6 q7 J; r* B
' d) h+ N$ R6 R; v1 z: M) g2 e8 \Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.3 @9 v% b/ K1 J) g. M
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Otherwise, find a professional or change a new set.