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You might be able to fix them.
There a couple of things that can go wrong with these units, dirty plates, bad contacts, and bad reostat.
The ozone is generated by the purification plates. They should be cleaned once a month with a solution of one part amonia and one part tap water. Use a soft bristle brush like an old toothbrush and scrub the metal contacts on the plates with the amonia solution. Be sure to do both sides. Allow them to sit with the solution for 10 minutes, then rinse off with tap water and allow it to dry completely.
There is a couple of metal strips that make contact with the purification plate. Check the contact strips and wires for corrosion. The metal strips can also be cleaned with the amonia solution as well.
The reostat is the part that attaches to the control knob that sets the purification levels. Sometimes it can go bad. The easilest way to check them is to use a meter and verify that as the knob is turned that the resistance changes with the position of the knob.
The Classic XL-15 should have 2 individual indicator lights. The 'red' light is the ionizer indicator, and the 'green' light is the ozone level indicator. Both lights should be illuminated, if the unit is operating properly. The red light should be pulsing, and the green light should be dimly lit, and brightened as the output knob is turned up - indicating a higher ozone production. If the green light is not lit, you likely won't smell the ozone. The first thing you should try, is cleaning the filter and glass ozone plate. Unplug the unit and remove the rear air filter. Clean the filter with clean water and allow to COMPLETELY air dry. Removed the glass plate by depressing the lever behind the glass plate, and gently pulling it out. Clean the glass with a half water, half ammonia (or distilled white vinegar, if ammonia not available) and an old toothbrush to clean between the mesh. Dry plate with a hair dryer and re-place plate into unit. Replace dried air filter, making sure the little tab on the bottom is secured into the interlock. Power the unit on and you should see the indicator lights and smell the fresh ozone!
How you proceed is going to depend on how comfortable you are taking it apart.
Given it's age and purchase condition, warranty isn't an issue. You will either be able to dis-assemble the purifier and try taking the motor apart and reassembling, or you can find a replacement motor (I've seen some on the web, they start at ~$50).
Can you control this odor by adjusting the ozone (O3) control? High levels of O3 smell obnoxious or irritating to some people; you want a fairly low concentration (~40 ppb - that's parts-per-Billion, not much).
It sounds like you've done everything else right. Have you consulted with the dealer you bought from? How about EcoQuest? If it's not the O3 level being too high, then perhaps there's something goofy with the unit. If it's under warranty, pursue that option. You should have contact infor with the unit; respond if you need it and I can post it.
Also make sure the safety interlock switch is properly closed when re-assembled. It's the springloaded switch inside the little notch in the chassis - the small tab on the lint screen should fit in and push that switch closed. If you do it wrong, the unit won't work. You should hear an audible click when the tab closes the switch.