DIYer here. I have suddenly hard water in the house. So I looked at my softener. It is a fleck 5600. I notice that nothing happens when I turn the knob to the 'brine rinse' manual setting. I have taken of the line to the brine tank and I get no suction or any sound whatsoever. Am I supposed to hear something in the unit (I think the motor only does the timer)? Is there likely a blockage in the injector unit? I'm happy to work on this, but I am not sure where to start.