Display shows “Err 9” and regeneration occurs at incorrect times or too frequently

Safety: No internal high-voltage work is required, but unplug the unit if removing covers.

• Verify programming: Enter the installer menu and confirm that water hardness, capacity, reserve, and regeneration time are set according to the Autotrol manual and your water conditions.
• Check meter type: Ensure the correct meter type (turbine, paddle, etc.) is selected in the control programming for your specific Autotrol valve and meter assembly.
• Inspect meter wiring: Confirm the flow meter sensor is connected to the correct terminals and that there are no shorts or reversed polarity (for Hall-effect sensors).
• Factory reset: Perform a factory reset and re-enter all parameters if the error persists. If the control still behaves erratically, replace the electronic control board.
• Monitor operation: After adjustments, monitor regeneration frequency over several days to ensure it matches expected usage.