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Leave the tank open for some time without the cap, in a cool place. The power light is green but there is no mist being emitted: . . . . . Check that there is water in the tank. Check for possible lime deposits on the water level float or the nebulizer. Make sure that nothing blocks the vapor output slot. Check that the air vent on bottom of humidifier is not blocked. Empty the humidifier and rinse the water basin with cool tap water and allow to dry for 15 to 30 min. White dust appears and sett