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 L; F; K4 |" ^7 i0 X. |
* l8 s; n0 F; GSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking./ }" b! Z# Z5 t; M; A8 L
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Otherwise, find a professional or change a new set.