When I turn on my Jacuzzi tub and push the button I only hear humming?

Trey, motor or pump is seized, have tech. take a look and repair.

Your problem is most likely NOT the air button but the switch in the motor.
Air Switch Repair
It sounds like you have a bad air switch located in your motor.
The air switch is what the air hose connects to on the back of the motor or on the box on top of the motor. The other end of the air hose is connected to the air button on the lip of the tub.
This is a latching air switch and when you push the air button it latches to send power to the motor. When the air button is pushed again it opens the latch in the air switch and stops power going to the motor shutting it off.

Rod
US Parts Center

Air Switch Repair
It sounds like you have a bad air switch located in your motor.
The air switch is what the air hose connects to on the back of the motor or on the box on top of the motor. The other end of the air hose is connected to the air button on the lip of the tub.
This is a latching air switch and when you push the air button it latches to send power to the motor. When the air button is pushed again it opens the latch in the air switch and stops power going to the motor shutting it off.

US Parts Center

How do you turn this on? If it is an air button that you push, it may well be the air switch in the motor is bad. The air switch is latching so when you push the button on the tub it closes the switch and lets the power go to the motor. When the button is pushed a 2nd time the switch will open and shut off the power going to the motor.
An air switch will cost about $21 to purchase.

Rod
US Parts Center

Try compressed air through the system,careful not to use too much pressure. Also you may use another water pump to push water through system and free up the motor. The easiest thing may be to get a new motor though.

In my case I took the motor out and used a screw driver to turn the impeller in the front of the pump and the fins inthe back. Put it back together and it worked. I then used 2 tablesoons of dishwashing detergent and 1/2 cup bleach and ran it for 20 minutes to clean and degrease the impellers

if when you push the air button it will not turn off the pump, it may be the button that is bad on the top of the tub or the air switch located in the motor.
take the pump out and plug it into an outlet. get a straw and blow into the air switch with the pump plugged in still. if it comes on then the button on the top of the tub is bad. if it doesn't come on then the air switch is bad.

mine did the same thing. the tub is plugged into a ground fault interupter (gfi) plug. hit the reset button. if this doesn't work, check the circuit the gfi is on, sometimes they are on the same circuit as the plugs at the sink. check them for reset also. if this fails, on the motor of the tub, there should be a reset button. try to reset it. OH first make sure the breaker has not been tripped.

that is the sounds of a bad air button on the side of the tub.

If it is a air button that pushes in and comes back up, there is a good chance that the switch (which is mounted on the pump/motor) is bad. If the switch is a touch button on a key pad, the problem is in the control box for the pump/motor.