signalstan

HI folks I need some help with my spa I just changed the water and every thing was running good and heating up I came back a few hours later to find the gfi tripped I unplugged all loads and sensors from the board then reset the gfi breaker the gfi trips only when i plug in the ribbon cable from the topside control panel leaving me wondering if its the control panel is bad or the main board Sundance spa capri #850 from 2005