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 V7 j# _7 U E: C
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.2 ^% [/ E0 Z( G2 B# d
& x+ \5 ^9 |' m, a/ ~ 7 e2 _) M- F. `+ ~* z2 X NOtherwise, find a professional or change a new set.