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. . N0 Z6 I! L$ p4 k9 E
/ c3 r# W5 M, `& I/ ]: ZSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. ; o" w; B3 K/ G4 J8 \& E+ g7 W, V" ?: d' {
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Otherwise, find a professional or change a new set.