I started getting a FLO code and the hot tube would basicly shut down...I replaced the flow switch but still have problems. I checked the filters and they are clean and the tub is full. The new flow switch I got is somewhat different than the old one. The old one was adjustable... right now the tub shuts down after running a bit and when I take one leg off the flow switch the unit starts up again and resets. any help would be appreciated..