It may be clogged due to mineral formation over time of not using it

I suspect that the iron is clogged with mineral deposits. This happens when ordinary tap water is used - more so if your tap water is "hard". First and foremost, buy a gallon of DISTILLED water.

Cleaning it is very much like cleaning an auto drip coffee maker. Empty the iron into the sink. The first method is to pour white vinegar into the reservoir and set the iron to the hottest setting. Tip the iron flat to allow steam to escape. Press any buttons that allow blasts of steam, too. The vinegar will dissolve minerals on the inside of the iron and clogging the holes on the bottom of it. If all holes are cleared after the first time, flush DISTILLED water thru the iron. If not cleared, you can try this second method: Fill it with vinegar again and leave it sitting flat in the sink - unplugged - over night. In the morning, refill with vinegar as needed and try the first method once more. It should be clear at this point. Flush with DISTILLED water.

You can prevent this from happening again by using DISTILLED water only in the iron. There are NO minerals in DISTILLED water, which are left in the iron when water is boiled off inside it.

Steam Irons and carpet machines should be filled only with distilled water. Repeated use of tap water can lead to mineral build up, clogging the tubes and vents. Using white vinegar instead of water can dissolve the minerals over time (fill and let sit) the best method is to disassemble the unit and clean the heating elements and all water baring parts.

A solution of white vinegar and water is a good cleaner for irons. Steam irons get clogged with mineral deposits, and vinegar works well to dissolve those deposits. Make a 50/50 solution of the vinegar and water and pour it in the iron, and place the iron on steam, allowing the solution to work thru the iron. You may have to do the cleaning a few times, depending on how clogged the iron is.

For future reference, use distilled water in the iron, because distilled water does not contain any significant amount of minerals. Distilled water can be found in the supermarket in one gallon jugs.

Leaking irons happen more frequently when performing lower temperature ironing. Minimize the chances of this happening by doing the articles that require less heat with a dry iron. When you're ready to do the articles that require higher heat settings, add distilled water to the iron after allowing it to cool first (some folks suggest using rain water as it will lack the minerals contained in the soil - where water pumped from the ground picks them up).

Distilled water is recommended by manufacturers for irons. Use of regular tap water will cause mineral deposits to form inside the iron that can build up and even clog the openings on the bottom plate. These can contribute to stains on the material being ironed, too. If you are unable to obtain distilled water, you ought to descale the iron regularly to remove deposits that will form by heating water or allowing it to simply evaporate. Distilled water lacks the minerals to be deposited by either of these situations. If distilled water is used - there is no need to empty the iron before storing. Tap water - whether supplied by the locality or a well is loaded with minerals and may be treated with fluoride, chlorine, etc.

Descaling an iron is pretty straight forward - no more difficult than descaling a coffee maker. Empty the iron of any water. Partially fill the iron with white vinegar and turn on to heat. Iron and old towel or rag to allow all the vinegar to pass through the steam openings.When empty, repeat once or twice - but with fresh distilled water to flush any remaining vinegar from the iron. When satisfied that the vinegar is out, store the iron. You can purchase products expressly made for descaling irons - just like you can for coffeemakers, but vinegar is a great low cost solution that works very well.

I hope this helps & good luck!

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.

The problem you're having is often cased by a calcium and mineral build up, due to the tap water you're using. To solve the problem, if it's not to late. Do the following:

Empty any water remaining in the iron. Mix a 50/50 solution of White Distilled Vinegar and Bottled Distilled Water (enough to fill the iron's water tater holder).

Pour the solution into the tank, plug the iron in and turn it to steam. Once it starts to steam, turn the iron OFF, unplug it and allow it sit face down on a flat surface, covered by a towel. Allow it to soak over night. In the morning, empty the prepared solution and refill with just the Bottled Distilled Water. Plug the iron in and turn it to steam. Allow it to steam for 30 minutes. This will flush any of the solution's residue from the iron. Any remaining water should be emptied from the iron.

In the future, I would recommend using Bottled Distilled Water, instead of tap water.

Hope this helped you. Please let me know. Thanks.

It may have a scale and mineral build up, prior to using bottled water.

To clean it, empty the tank of any water that's already in it and fill it with a 50/50 solution of White Vinegar and Bottled Distilled Water. Allow the solution to sit in the tank for 30 minutes, before turning the humidifier ON. Once the unit is ON allow it to run for at least 30 minutes, then check to see it if it's misting, by holding your hand in front of the nozzle. If it is, allow it to run until the tank is 3/4's empty. Turn the unit OFF, unplug it and pour out the remaining solution. Then fill the tank with Bottled Distilled Water and run the unit for one hour. This will allow enough time, for the Distilled Water to flush the system. After that, fill it again with Bottled Distilled Water and use the humidifier as you normally do.

If it didn't start misting when you turned it ON. Allow the solution to set for 3 hours and then try it again.

Hopefully, this will solve your problem. It does 95% of the time. Please let me know if it worked for you. Thanks.

It may be clogged with mineral scale. Empty the water that you now have in the tank and refill it with a 50/50 solution of White Vinegar and Bottled Distilled Water. Let it soak for several hours and then turn the unit ON. If it starts working as it should. let it run another 5 minutes, turn it OF and empty the tank. Refill the tank with Bottled Distilled Water and allow it to run at least 45 minutes to flush the system. After that, if you do not detect any vinegar odor, you can continue to use the remaining Distilled water.

If the unit didn't work as it should have after several hours of soaking. Turn the unit OFF and let it soak overnight. If this solved the problem, I would recommend that you continue to use Bottled Distilled Water for normal operation, rather than tap water.

Hope this helped solve the problem

If you haven't done so already, try running a cup or two of household (white) vinegar through it. Just pour room temperature vinegar into the fill reservoir. Follow with two full amounts of distilled water (not tap water) to clear the vinegar out. Then try to use ONLY distilled water or at least water that's been through a mineral filter. Calcium buildup from running tapwater through the small heating tube is what clogs up most coffee makers.

BTW, not all "purified" water sold in stores is distilled. It must be STEAM distilled to be true "distilled" water. Wal-Mart carries it. Other stores do, as well, but make sure the bottle actually says something like "steam distilled" on the label, otherwise it's probably only run through a filter. "Purified" water may also be treated by reverse osmosis, which removes some mineral content, but this is NOT steam distillation, the process which removes (almost) all of any mineral contaminant.