Water remains hard even though the Tier1 softener appears to regenerate normally.

Safety first: If you need to open plumbing, shut off water and relieve pressure first.

• Verify bypass position: Ensure the Tier1 bypass valve is fully in the SERVICE position, not in BYPASS or halfway between.
• Check hardness and capacity settings: Enter the programming menu and confirm the hardness matches your water test (in grains per gallon). Ensure the capacity and reserve settings are appropriate for your household usage.
• Increase regeneration frequency: Temporarily lower the capacity or increase the regeneration frequency so the unit regenerates more often. Monitor water softness over several days.
• Test resin condition: If the unit is older or has been exposed to iron, the resin may be fouled. Perform a resin cleaning using a resin cleaner product compatible with Tier1 systems, following label directions.
• Replace resin if needed: If hardness persists despite correct programming and cleaning, replace the cation exchange resin in the mineral tank. This is a more advanced repair and may require a professional.