Display shows “H0” or similar hardness error and water feels hard between regenerations

Safety first: No disassembly is required for initial checks.

Step-by-step checks:

• 1. Verify water hardness:
  • Use a hardness test kit on raw water (before softener) and on softened water (after softener).
  • Compare to the hardness value programmed into the Kenmore control.
• 2. Adjust settings:
  • Increase the programmed hardness slightly (e.g., by 3–5 gpg) to compensate for iron or changes in supply water.
• 3. Check flow meter:
  • Ensure the turbine / flow meter is clean and functioning so the control can track gallons used.
• 4. Reset and monitor:
  • Perform a manual regeneration and monitor water softness over several days.
  • If H0 or hardness error persists and settings are correct, inspect and replace the turbine / flow meter assembly or control board as needed.