I have a 9410 DC skimmer which has been running for about a year with no issues. Last night it stopped working. The dial on the controller is blinking blue. There are no obstructions in the air line. I removed the impeller from the pump and cleaned it. There did not seem to be any obstructions. It turns freely by hand. When I put it back together and power it up, The impeller moves slightly then stops and the dial on the controller goes back to blinking blue. Any help would be greatly appreciated.