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. + E: j9 N/ G( w
( e9 `" K$ a% ^7 hSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.$ {$ L: S* [0 `# t3 J
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0 D/ i8 H, [( c. a/ F! h: {/ o8 yOtherwise, find a professional or change a new set.