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let it dry completely, disassemble as you would for cleaning, and remove filter unit. Inspect to make sure no paper or other debris like a seal has been dislodged. If you can see fan blade, see if it will turn with filter removed. If it moves easily, reassemble carefully and make sure the contacts are oriented correctly and any charcoal filter is on place as well. Try unit.
If noise persists, the unit has to be opened up to inspect bearings of fan/motor and to locate and remove any debris. At that time a drop of light sewing machine oil or pellet gun oil to lubricate the bearings is a good idea.
The clicking noise is the sound of the high ionizing voltage 'shorting' due to dirt or humidity or both which provides the pathway for discharge. Cleaning and completely drying the filter(s) does not always help, in this case switching the unit to a lower operational speed can mitigate this problem. New filter(s) may be needed to resolve the clicking.
While the device is turned off and the filter is out, tip the unit itself upside down and back. Do this several times, there is a slider type cleaner inside that moves as you turn the unit. Be sure to do this every time you clean your filter and you will never hear a peep out of the thing.
My air purifier was doing the same thing. The ticking noise you are hearing is caused by dust build up on the ionizer pins. When the ionizer pins collect too much dust, they tend to start making the clicking/ticking sound caused by static electricity. The solution is simple. Take the filter out and clean it real good (follow directions on filter on how to clean). Now, with the filter out, if you look down inside the vent where the filter was, you'll see a white piece of plastic with nine holes in it that are about the size of a silver dollar. Directly in the center of each hole there will be something that looks like a needle, those are the ionizer pins and they will probably have dust built up on them. Next, with the filter out, blow out the air purifier with compressed air to clean all the dust off the ionizer pins. This should take care of the problem, it worked on mine.