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. 5 J1 q5 g* p; C
' N# `1 ?/ r6 Q# m% V0 z# R/ hSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking./ B2 Y' ?8 y# [ E
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7 Y0 H$ n" s7 N3 E! t% _Otherwise, find a professional or change a new set.