I have gotten so much from this forum so heres something I want to add.
If you notice less bubbles emanating from your ozonator it can be telltale. In fact its likely not your ozonator nor its injector. I learned hear that most of the bubbles are just air that is being drawn in along with a bit of ozone from the oz generator.
In my experience diminished bubbles are due to circulation problem. usually something as simple as a water intake blocked with yuck of some kind or a clogged filter that needs at least a good rinse and perhaps a chemical clean. Both those conditions can cause other problems including hi limit switch/ breaker tripping.