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. ) `: H r# |" S- Y: O& e/ S
& X5 H+ f4 m, [% ?; T+ ?& B; Q+ X3 aSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking. 1 `5 f3 d, @! ~, T4 w/ E( ` x N( v4 v- I) F+ d, V, D, `2 k0 k2 ~* z1 ]
Otherwise, find a professional or change a new set.