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. : a) F5 y0 @) _! n" S) }- h; | 1 z3 @" F* n* t4 u- N9 {; X5 ]5 t# ^% NSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. ( P- K1 ]& Y$ r" m1 ?$ C6 z/ l- n& m) K3 J8 }% a) @( f
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Otherwise, find a professional or change a new set.