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. 2 Z7 y k' x2 c/ ^
8 z3 P: o9 s$ ]6 q$ j/ `Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking. 1 ?3 c0 q9 C1 d/ X, t, Y8 y ! S* k N/ A! b3 j4 t / T: w4 j1 c: M uOtherwise, find a professional or change a new set.