Pool and Spa
Questions about Pool Repair? Ask an Expert Online.
Here is a link to see what a flow switch looks like so you can more easily find it. http://www.spaparts123.com/24arspflsw.html now because it is an Island spa the switch may be bigger than this but it should say Flow valve on it if it is the bigger one. It is usually located just after the heater assembly.
Sorry you are feeling frustrated. Please take a picture of the inside of your spa so I can see what you are viewing and I can point out where you should be looking.