New Ozonator Not Producing Bubbles

[Dietitian]

I have a 50mg/hr ozonator that I just installed on my ozone-ready tub, and it does not appear to be producing bubbles. Should there be visible bubbles if the machine is working?

It makes noise/powers on, but no visible bubbles....

[Dr. Spa]

Should there be visible bubbles if the machine is working?

No. But there should be visible bubbles if the injection system is working.

[Dietitian]

Should there be visible bubbles if the machine is working?

No. But there should be visible bubbles if the injection system is working.

Can you clarify? What is an injection system?

[Dr. Spa]

An ozone ready spa has a tube you plug into the ozonator. That tube should be sucking air (typically by way of a venturi injector), pulling it through the ozonator (the ozonator converts some of the O2 into ozone). If the tube isn't sucking, no air will be drawn through the ozonator, working or not).

[Dietitian]

An ozone ready spa has a tube you plug into the ozonator. That tube should be sucking air (typically by way of a venturi injector), pulling it through the ozonator (the ozonator converts some of the O2 into ozone). If the tube isn't sucking, no air will be drawn through the ozonator, working or not).

The tube (attached to the ozonator) is connected to the spa and water spills out of the tube if the ozonator is disconnected, but does not suck air into the spa.

What are some possible reasons that the tube is not sucking? The spa and all jets seems to be working normally.

PS The tube I attached the ozonator to is not 3/8" as expected, it is bigger. It was hanging in the equipment area with a plug at the end. Is the ozone ready tube always 3/8"?