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. ) g; l( Q, E! ]4 b: C 4 x+ H, B, N. D4 \; k# j/ lSolution: turn off water supply and take the humidifier apart and clean it will stop the leaking.5 Q e) R+ S" L0 n5 E0 b* k
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Otherwise, find a professional or change a new set.