we just bought a used jacuzzi brand tub, a quantum plus platinum, and everything works good except one side does not produce any bubbles even when the air controls are moved. motors are working correctly, and blower motor is seperate and works fine. no error on control panel. any ideas ? i am sure it is a simple fix, but dont know much about spas, yet anyway. also, how can you tell if the Ozonator is working ? being a used tub, you just have to take there word. thanks in advance, I can tell this forum is used a lot, and everybody seems to want to help, and I really enjoyed the picture section, gave me a lot of ideas for the future......

You may want to disassemble the air induction knob for the side in question. Possibly blow air thru it - that may do it.