My spa runs on 110V and is plugged into an exterior weather protected GFCI outlet. I was having no functional issues with my hot tub before I recently drained, cleaned and refilled the hot tub. I started the spa, but after about 3 minutes of running the GFCI outlet tripped. I started trouble shooting by disconnecting components one by one from the main board. First I disconnected the top side control panel, but it still tripped. Second I disconnected the ozone, but it still tripped. Then I disconnected the light, and it seemed to run a bit longer, but it still tripped. As my spa runs on 110V and the heater is disengaged when I put the jets on full, I tested the heater by putting the jets on full. When I put the jets on full the GFCI does not trip. When the high jet cycle ends, the GFCI trips about a minute later. I am guessing now that the issue is with the heater element. Where do I go from here? Thanks.