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. ) G4 t& y; s* N( I4 x ' P6 P2 d* J+ KSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.3 h& X2 Q# \: A- v# y7 T
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( N* _8 `1 l# mOtherwise, find a professional or change a new set.