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. # ~9 E" p; L6 K, B. l" V - U# v+ |% V+ U0 V% K& qSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.$ `3 P( {$ F/ j( U9 ^3 U
$ V; m) \4 z. x 9 U W1 |* l3 d( |0 L$ ~# p* ]Otherwise, find a professional or change a new set.