My new house came with a hot tub that we were unclear as to whether it worked. Last year I filled it up and fired it up - and found that it worked perfectly! I tested it for about three days and everything was great. So I started doing research on what chemicals I needed to buy, got the stuff together, and started it up again (it had been sitting for a week with water in it while I figured out what I needed to do to the water); this time the motor came on and everything sounded normal, but no water was pumping. I looked around on line (the repair manual's troubleshooting basically said to have the dealer come out and bill for any problem), and it looked like a blockage in the pump was the most likely problem. I finally got around to opening the pump today, and no blockage. I filled it up and flipped the breaker and the breaker (a GFCI) immediately went to the reset position (the digital display window on the pool's operation panel shows a boot up sequence for an instant then goes dark). Any ideas? Should I replace the GFCI? Or is it more likely that the pool is throwing the GFCI (and will do the same to any other GFCI)?