Jacuzzi brand, cirrus model spa.

The problem is that air is not being inducted into the jets. Instead, when I open the air control to increase air flow, I get water comming out of air control assy. There's no blockage in the jet (I've checked). What gives?

I have had that problem with my Jacuzzi (not sure of model) and what it turned out to be was a missing insert in the jet nozzle. Not sure if this is your problem, but it might be worth while to check out and see if you have any nozzle parts missing.

it can only be a jet related problem - jet nozzle blockage or missing - nothing else can cause this
on spas with threaded jets or with o rings - look for a bad seal that seperates water from air - this will also do it