bethshar
It sounds like you do not have the jumper installed.
Roborph
Your ozonator should make a faint humming or buzzing sound. Also, there is a short piece of tubing near the top that should be the air intake. If you put your finger over the end, there should be a slight suction. There should also be bubbles comming from your circ pump jet at the bottom of your spa. Now all of this, of course, does not verify that the unit is actually producing ozone.