Display shows ERR10 and unit locks out regeneration cycles

Safety: No internal high-voltage work is required for basic checks, but unplug the unit before removing the control cover.

Steps:

• Verify programming: Check hardness, capacity, and regeneration frequency settings. Extremely low capacity or very high hardness can cause frequent regenerations.
• Check flow meter accuracy: Compare the unit's usage reading to your actual water use. If the softener thinks you are using far more water than you are, the flow meter may be faulty.
• Reset lockout: Consult the user manual for the procedure to clear a safety lockout or perform a factory reset. Typically this involves holding specific buttons for several seconds.

Resolution: If ERR10 returns after reprogramming and reset, inspect and replace the turbine flow meter assembly if it is over-counting. Persistent ERR10 with a good flow meter indicates a control board fault.