We just bought a house and it came with a hot tub. It's a 2006 Marquis Spa that plugs directly into an outlet. The previous owner said it worked just fine but she hadn't used it in the last two years because she didn't want to maintain it. I got it all filled and ready to go, turned it on and ran it on the high jet setting. It ran for 25 min like it's supposed to then went to low to continue the heating process. After two minutes the GFCI on the power cord tripped and shut down the tub. I tried it a few more times and the high setting will continue to run fine but when on low it's two minutes and then off every time. My local hot tub store suggested it was the power cord so I replaced it and still the same thing. I don't really know anything about hot tubs but don't want to spend a bunch of money to have someone come look at it. Thanks for any input!