Mark 89, First up is the backwash and then it moves to the brine draw and slow rinse(draw and slow rinse)are part of the same step in the cleaning cycle or the motor moves the upper and lower piston to the next step so that the draw can happen and then the slow rinse continues after the brine has been drawn out of the salt tank.
Now some thing that could be is the main piston has a seal or two that is bad and allowing a cross over with in the valve body and not allowing the proper brine draw if your not getting any.
The main piston could have a scratch and no matter of seals will cover that.
Either way I would go after a rebuild kit or see about moving the middle seals to the ends of the seal pack assembly and main piston and see how that goes.
Yes yours will need a replacement at some time, but lets try and get this one running for now.
Now some thing that could be is the main piston has a seal or two that is bad and allowing a cross over with in the valve body and not allowing the proper brine draw if your not getting any.
The main piston could have a scratch and no matter of seals will cover that.
Either way I would go after a rebuild kit or see about moving the middle seals to the ends of the seal pack assembly and main piston and see how that goes.
Yes yours will need a replacement at some time, but lets try and get this one running for now.