I have a Catalina spa that I bought used about a year and a half ago. Last week I got the error message "FLO" on the display. I ordered a new pressure sensor and just installed it, nothing changed. The display still says "FLO" then flashes to to 55 (degrees), then COOL, then back to FLO and so on. Nothing on the spa works, pumps, lights, stereo etc. I already pulled the filters out and the spa still didnt work. Do the pressure sensors come from the factory preset or do I need to adjust it? I live in Denver and its getting cold and I'm worried about the thing freezing up and causing more problems. So if I cant get it fixed soon I'm going to drain it. I would appreciate ANY help, suggestions, or experiences!

Thanks!

About 4 days before the spa stopped working, I found a towell stuck on one of the suction fittings. Could this have caused the problem?

I checked for power on both pumps and I have 123 to 125 volts on each terminal. So the pumps are receiving power. Is there a way to see if the pumps work? Im wondering if the towel on the suction fitting caused a pump failure. Also, there is a red light on, on the control board which may be caused by the FLO error, or does it mean something else?