My 155 series 155 has been in place and functioning for 10+ years. Over the last few weeks, my water presssure (hot and cold are softened)had gotten progressively lower and it didn't seem that it was being softened.
Water company suggested bypassing the water softener - I did and that restored pressure. I recently cleaned the injector and filter, manually ran the regeneration cycle, and have same results - low pressure, no softening.