Tiger River Spa by Hot Springs (serial M-130143). SO, I've had this maintenance-heavy spa a while--and after changing out the relays a couple times over the years, and finding a new main board that was still available for this old spa I decided to change it out. I replaced the top controller board as well. Now the spa comes on when plugged in and immediately the GFCI shuts it down, but only when the main pump or thermostat is turned up. Disconnecting the heater and main pump alleviates the shut down (so I guess I'll be looking for moisture and ground faults in my heater and pump)---but Also, the circ pump shuts off after running for 30 seconds--even when I jump the flow switch on the main board! Now what?? It's a brand new board?!?!? Why might this 30 second shutdown be happening?