Can anyone tell me does a flow switch run all the time or does it kick in based on low water pressure or flow???? Can't find a place to plug my flow switch in on my Cal Spa PS-5.

Any ideas???

A flow switch is used only for verificaton of water flow during low speed heat cycle, so the heater doesn't "dry fire" (heat with no water flow).

Hey you are welcome to use my spatech free of charge he is a Cal Spas exclusive 303-623-0100.Ask for service they will guide you as to where to plug in the flow switch.