Some tubs have a powered blower (you can hear it) or some tubs have a venturi suction bubbler system, you will have have to pop open service cover to look to see what kind you have, venturi type most of the time are turned off or down to far and don't produce bubbles (twist knobs) powered blowers sometimes have hoses pop off there fittings
SOURCE: The main jets are working,
ozone generator is either out, or one of the ozone tubes in the spa are broken.
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