I have an A&A mfg low profile 6 port valve. When I run the pump on a low speed all the pop-ups rotate as they should and I can see the paddle wheel spinning, though I don't think they pop-up as much as they should. When I run the pump on a higher speed, I think the paddle wheel is spinning (hard to tell) but the pop-ups are not rotating from one section to the next. At the higher speed I hear a clicking noise inside the valve unit about the time the next valve should open. Maybe the gears are binding? again, not sure. If I take the lid off and spin the paddle wheel a complete rotation, everything is fine and it spins freely. This is a recent development. Anyone have any ideas?