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I own a 2008 model of Balboa circuit board, Sundance spa. Circulation pump is Marathon Electric, Model 5kCP49UN9096X. Capacitor Model number is 24DB500B370PA. I haven't had any problems with it until now, so it's been a great learning curve on figuring out how to fix it, but very interesting too. The initial symptom was that the spa would not budge from the "PR" priming code, and then would just go to a HH code, that things had heated up due to no circulation, and it shut itself off, with the spa going into EC (economy) mode. The circulation pump does not even start humming. Thinking it might be some air, I tried some things to try and move it through. I turned off the power for a while, then turned it on, and didn't wait for the PR cycle. Instead I turned on the air jets, moved it into ST (standard) mode, and the heater would then kick on. The circulation pump would start running, and it would work fine. So it's not air. Two things I noticed: 1-The jets run for about 5 minutes before turning off on their own. If I don't again turn them on manually, the spa gives a DY or DR signal after a while. The circulation pump just seems to quit pushing water through to the heater, as the filter stops working. However, the circulation pump is humming-- it's just not pushing water through (so I turn it all off). 2-I can keep turning it on manually every 3-4 minutes, and it works just fine. Filter works, pump works, heater works. Something is wrong though, so I've been taking the whole thing apart, and it all looks real good inside circuit board and heating unit. Pump moves, isn't clogged. So all of this points to the capacitor of the circulation pump. I have two pumps in this system. I am only looking at the one that's between the filter and the heat pump, not the air one on the other side. I thought I would be looking for a Start capacitor, but there is only one capacitor on this model, and it is a Run capacitor. I have two questions: Does the capacitor in this case serve as both a Run and Start? Given the Run works (because it still hums) I don't see how it's malfunctioning if that's the case (though it wouldn't be the first time something works beyond my comprehension). Or is there something on the circuit board (which looks great) that sends the start to the circulation pump that I am missing?I am going to order a new capacitor, as that's only $10. What sort of testing of the system can I do without water? Or, do I have to fill the spa all up before I get to see if swapping out a new capacitor is all that is needed? I'll update as I go along here, many thanks for any questions or help.