Balboa told me my flow switch was probably bad. Does anyone know how to jump it/ or test it to see if it is working right? They wouldn't tell me on the phone.

A flow switch is just that --a switch. Normally open, but closes (making contact) when it senses flow. The way to jump it when still in the tub is to find where it is connected to the main board, disconnect it and jumper the terminals, simulating a closed switch sensing flow. If the error message goes away the switch is bad.

When out of the spa, check the resistance between the wires, with the switch open it will be infinite, with the switch closed it will be zero. If not then it needs replaced.

It never had an error code. It isn't heating and the light on the top side controlls for the heat is not coming on. I pulled the element and it was fine. Then i called Balboa and they said it was probably the flow switch. What do you think?

I think you should do like I suggested and test it.

I jumped it and the control said flo. There is no error code when the switch is hooked to the board.

the "flo" code indicates no flow (open circuit), you should get the same message with no jumper and the flow switch disconnected. I suspect you didn't have a good connection on the jumper. (I am assuming the Balboa switch is normally open and closes with flow.) Anyway if you have no error code when everything is connected normally then the flow switch is probably ok. Did you also check continuity across the switch wires when disconnected? You might try removing the switch and bench testing it.