Pool and Spa
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Ok well there were a few different ways that they wires these bathtubs, most commonly was an air switch which looks like this
Now you would press this air switch and it would push a stream of air through clear tubing and down to a switch in the control box which in turn would allow power to go to the pump motor and start the spa. If you press down on this air switch and the button does not rise back up quickly then the air button is dead and replace, if it does work then you need to tract the air tubing down into the control box and test the air switch in there to see if it is allowing power out of the switch to back of motor if not replace that switch from there test voltage at the back of the motor if voltage is good there the pump motor is bad and replace pump.
Now if you have a newer design and there is no air button then you have just an electronic control that goes to a relay on a circuit board inside the control box and you would need to test voltage there and the pump as well.