My jacuzzi whirlpool tub turns on when it wants to. The button works about 20 percent of the time.

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

This is is a problem that develops over time. The center of the air button can get calcium built up and the close tolerances of the button and the inside of the button body will begin to stick.
Take some soft emery cloth and run around the inside of the button bosy and the outside of the button then reinstall and see if that will prevent the button from sticking in the down position.

Rod
US Parts Center
888-521-6183

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

Call a local bathtub service company but check to see it the tubing on the back of the motor has come off. If your tub turns on/off with an air button on the top of the tub, that tubing has to be hooked up in order for the pump to be able to turn on/off.

let me know if you need further help. I would need to know what the control looks like on the top of the tub in order to further assist you.

Rod

Power switch appears to have a short in it. See the dealer you purchased the tub from and have them install the part.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/don_e04c7d10037aa2ce

I think your air switch needs replacing

there might be a fuse at the pump that has blown

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

check to make sure the pumps on and that its wired correctly and that all valves are open.

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.