I purchased a new home last spring and it came with a Sundance Sentry 800 hot tub, probably purchased in the mid to late 90's. Everything was fine until a few weeks ago when the wet end started leaking. I replaced it and turned it back on to heat up. It ran ok for about 2 hours and then I started getting a Flo error. It stays off for a few minutes and then tries to kick back on but turns right back off after about a second. We have tried talking to a local distributor but they have been less then helpful. Any suggestions on what I should try.