Before replacing the resin, consider running some resin cleaner (such as Iron-Out) through your water softener.
Resin beads typically last 10-20 years, but they can get coated with rust and gunk and stop working earlier. Operation research by panneerselvam pdf printer. If your injector is clean and your water is still hard, then the problem could be the resin beads. The owner's manual (see link above) has simple instructions explaining how to disassemble and clean the injector. Assuming the timer is running normally and your water softener is using salt at a normal rate, the first thing to check is the injector screen.
A very common problem is a clogged injector.
