Display shows “Err 09” and unit indicates abnormal temperature or shuts down during very hot or cold conditions

Safety: Disconnect power before accessing internal components.

• Check ambient conditions: Ensure the Ecowater softener is installed within the recommended temperature range (typically 4–49°C). Extreme cold or heat can trigger protection.
• Locate sensor: Find the NTC temperature sensor on the valve body or manifold. Verify it is firmly seated in its well or clip.
• Inspect wiring: Follow the sensor leads to the control board. Look for cuts, abrasions, or loose connectors. Reseat the plug.
• Measure resistance: With power off, disconnect the sensor and measure resistance with a multimeter. Compare to Ecowater specifications at room temperature. An open or near-zero reading indicates a failed sensor.
• Replace sensor if needed: Install a compatible Ecowater temperature sensor and clear the error by power-cycling the unit.