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. 7 l% K- ~1 x& G' ~" G2 F9 c
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Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. 8 [7 u- s' Z6 u T$ M [" i$ q6 M1 y
3 [. W: ~/ |4 V3 N" ]. \Otherwise, find a professional or change a new set.