My Clearwater Spa, Beachcraft series started throwing this error the other day. The error indicates that there's not enough water going through the heater. About a month ago I had to replace the circulation pump because it was tripping the breaker. I saw that the heater was all rusted out, so I replaced that too. What oh what could it be now? I shut the spa down overnight then turned it back on. It says it's in priming mode 'pr', but there's nothing coming out of the bubbly thing that I am guessing is hooked to the circulation pump. It's quiet as a mouse. I then tried turning on all the jets, but only jets 1 & 2 are working. I tried calling Clearwater yesterday, but they're closed on weekends. Anybody want to speculate what I might be up against here? Hope it's not the controller board!!! Arrrrrrrrrrrrrrrrrrrrgggggggggggggggggghhhhhhhhhhhhhhh!!!!