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. 1 r- R- `6 s* t# Y1 V( ]* _% { % O. o3 y3 S1 [3 L3 I( [3 U) QSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.3 g$ R/ \- i5 s& @9 O
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Otherwise, find a professional or change a new set.