When I push the activation button of my spa, nothing happens

Try this:

If you find that all but one of the air buttons are working, it could be that the clear air tubing that connects to the bottom of the air button has become disconnected, or, a rodent has chewed through it. Also make sure that there is no water in the air tubing, this would affect the performance of the switch.

One end of the clear tubing should connect to the bottom of the air button, and the other, with a continuous run to the spa control box (air receiver).

If you push on more than one air button and nothing happens, then refer to the "Nothing Works" section.