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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
First the obvious, most are electrically connected to a ground fault device, ether an outlet or a breaker. BEFORE ADDING WATER, check these out to make sure they are not tripped. Most all tubs have a minimum water level which must be reached before the jets will operate. This is usually a piece of trim located above the depth of the jets. Make sure the tub is filled to cover this part. If you cant identify the water level device fill the tub so that all the jets are covered by an inch or 2. Some tubs have push button switches or touch pads to control the motor, some have touch sensitive trim. There may be some sort of medallion from the maker on the tub, simply touching it will start the tub. Once you get it going most tubs have a built in timer that turns off the pump in 15 - 20 minutes. For more tub time just hit the switch again but keep in mind that extended exposure in a hot tub can mess with your blood pressure and cause you to loose balance or pass out, hence the 20 minute timer.
Is it a jetted tub, or a air bath tub with holes or jets in the floor? If it has holes or jets in the floor, the control box is bad and needs replaced. If it is a jetted tub, there may be a water level sensor, if so the sensor may be bad causing the tub to turn on.