I have a Sundance Spa Oltima 2004. I just bought a house with this hot tub. The display shows a "FLO" error on the screen and the hot tub is taking days to heat up. It's now at 95, but it took 2 days just to get to that. Pump 1 has two speeds. It only works on high speed. On low speed, it just makes a clicking sound. Does this mean that I have to buy a whole new pump 1? Pump 2 works great. Any help will be much appreciated.