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I have a GREAT LAKES GL-5 hot tube with a Balboa GVS-500. My tub will run for a few days then the GFI will trip. I let it sit and I can switch the GFI and it will power. Today this happened again and I try to turn on the GFI and it trips immediately.
When it was running it would heat the water to desired temp.
With a tripping GFCI the first thing to check to see what may be causing this is the heater. You want to make sure power is off to the spa and then disconnect the heater. Once it has been disconnected go ahead and power back up and run your pumps. If GFCI holds then sounds like you need to replace your heater.