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 |- c7 c( N% A7 R$ K% }! _$ a! M* F) {- ~. D0 [. V8 J9 M0 x
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. + P0 ?- g6 Q: {' P" a! U4 H' D0 |0 k
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Otherwise, find a professional or change a new set.