I have a Dynamite Pac-Fab Jetted tub (approx 15 years old)in a home we just bought and am looking for some guidance. The air switch will activate the tub but will not turn it off. I need to know if I have a faulty switch and need to replace it or if there is another solution. I have let it run for 45 minutes thinking perhaps it is on a timer, it still didnt turn off. Any thoughts?