I have sort of deduced that my circulation pump isn't functioning properly. It runs for about 2seconds, turns off for about 2-3 seconds, then repeats for a few times and then just doesn't run at all. It's the 665510 pump. However, I want to make sure that the control board is driving it properly before replacing it. How should this circuit be tested. There are three wires, black blue and white. I assume white is neutral, black has 120v on it at all times (even though the schematic says it should be switched) and blue well not sure what its doing. Can you measure the coil resistance across any of these lines? Any help would be greatly appreciated.