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. " z, f+ |4 U. Z7 r& D2 Y4 C: e2 ]* r3 s8 R Y/ ]# j
Solution: turn off water supply and take the humidifier apart and clean it will stop the leaking.7 I2 p7 O( D7 f
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Otherwise, find a professional or change a new set.