I am sorry but i didn't understand if i need to mix de medicine with water or put in medicine cup. I lost the instructions....thanks

If it's a de-humidifier, it is made to take the water out of the air. Usually you will need to take the water out of the de-humidifier that gets condensed out of the air.

An air humidifier works in the opposite way and would need to have water added to re-humidify the air.

Mix 1/4 cup of bleach with 1 gallon of cool water for a disinfectant solution to kill the types of microbes that like humid areas. Rinse with clear water.

The problem is more than likely due to a calcium and mineral build up in the tank and the tubing.
Hopefully, it's not to late to do something about it. So follow the instructions below,

Unplug the unit.

Remove any remaining water from the tank.

Mix a 50/50 solution of White Distilled Vinegar and Bottled Distilled Water (enough to fill the tank) and pour the solution into the tank. Allow t to sit overnight. In the morning, plug the unit in and turn it ON. If it doesn't start producing steam, turn the unit OFF, unplug it and empty the tank. Mix more solution as described above, pour it in the tank and allow it to set for 3 or more hours. The plug the unit in and turn it ON. Hopefully, this time, it will start to produce steam. If it does allow it to run until the tank is half empty. Turn the unit OFf and empty the remaining solution from the tank. Refill the the tank with Bottled Distilled Water and run the unit until it's empty. That will flush the system.

In the future, I would highly recommend the use of Bottled Distilled Water, rather than using tap water.

If the above didn't solve the problem, it's time to buy a new humidifier and use Bottled Distilled Water in it.

If the instructions didn't mention how to clean the unit of scale and mineral deposits, that's more than likely the problem.

If that's the case, here's what you need to do: Empty the tank of any more that's still in it and mix a 50/50 solution of White Vinegar and Bottled Distilled Water. Fill the tank with the solution and allow it to set 8 hours or over night. Then tunr the unit on and place your hand in front of the mist nozzle, to see if it's producing mist. If it is, let it run for at least 45 minutes and turn the unit OFF. Empty the remaining solution and refill the tank with Bottled Distilled Water. Run the unit until the tank is 1/2 empty and refill with more of the Bottled Distilled Water. Now, you're set to go. In the future, I'd recommend that you always use Bottled Distilled Water rather than tap water. As it's mineral and scale free.

Hope this helps to solve the problem. Please let me know. Thanks.

Sorry to read about your problem, I hope this helps you out.

try putting some white vinegar in the unit like a cup with water, let run a while, then put fresh water in
I tried to help you. Please help me and Rate/Vote on my response, thanks and good luck

Instruction manual: http://www.crane-usa.com/manuals/HumidifierManual2008.pdf

medication was never meant to go into a humidifier. it clogs the transducer. if you can clean the vicks off the transducer plate you might squeeze another season out of it, otherwise by adding medication to the machine you just gave it an early death.

For Model V745A Vicks Warm Mist Humidifier:

Weekly Maintenance (Removing Scale)

1. Turn the switch to off and unplug the corn from the wall.
2. Remove Water Tank and empty any remaining water from the water tank.
3. Remove Medicine Cup from the Cooling chamber from the Base. Carefully remove the Cooling Chamber and Removable Water Tray from the Base.
4. Soak the Removable Water Tray in a solution of white vinegar and water for 20 minutes. Rinse thoroughly and then wipe dry with a soft clean cloth.
5. Fill the heating chamber with undiluted white vinegar. Let stand for 20 minutes. Dampen soft, clean cloth or sponge with undiluted white vinegar and wipe out Heating chamber to remove scale. DO NOT use soap, detergents or abrasive cleaners.
6. Rinse the Heating Chamber using clean warm water, being careful not to submerge the base in water.
7. The Water Tray, medicine Cup, and Cooling Chamber are top shelf dishwasher safe.