I have a Duoclear 60 and an a Ecostar pump. Up until recently, when the pump was turned off either manually or automatically, the "no flow" light would come on and the SWG would disable. Now when the pump is off the "no flow" light doesn't come on and the SWG seems to be still running. I have to turn the Duoclear off manually. I know the light works. I removed the cell and soaked it in cell cleaner, and hosed it off well, but still have the same issue. The cell is 7 years old, and is working ok except for this. Any suggestions?