Brine tank not filling

We have a Fleck manual controller and last week the dishwasher was getting us gritty dishes. We called a water softener guy and he said it's calcium on the dishes. I know calcium comes from hard water so I checked the valve and found it not working. A mud wasp built a nest inside and froze the gears and broke the case. I bought a used controller and it works OK. I checked the place where the water goes to the brine tank and water came out when I turned the dial. I filled the tank with water and in a couple of days it's almost dry again. What now? Thanks