Over time the wear and tear on the Pistons and Seals can cause the Valve to become STUCK in the regeneration cycle.
Replacing these parts will usually restore the softener valve to like-new condition.
Main Piston Assembly Fleck Part (Grey Piston)
Brine Valve O-ring
Seals and Spacers Kit Fleck Part
Brine Valve Piston Fleck Part