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I have an older Sundance spa that came with my vacation home. When visiting this weekend, I found an "FL O" error on the tub and it would not heat. (All other functions, blowers, lights etc work). I took out the circulation pump, it appeared to be stuck and then it freed up. I refitted it but it still did not run. I also tested the pressure sensor and tripped it into closing which started the heat but still no water flow (Stopped that after 5 seconds to avoid any burn-out/over heating etc). I'm pretty certain the circulation pump needs replacing, but I want to check it first but am not sure if it constantly runs or not - If it does then I know I should expect a constant voltage to it whilst the spa is on. Thus, my question is: Should the circulation pump be constantly running even when the spa is not heating? Any advice would be great, thanks