Display shows “Err 04” and water flow is not being measured correctly (usage stays at 0 or jumps erratically)

Safety: Close the bypass valves and relieve pressure before removing any plumbing connections.

• Verify flow reading: Open a tap and check the Ecowater display for flow indication. If it remains at 0 despite water flow, suspect a sensor or turbine issue.
• Inspect turbine housing: Isolate the softener using the bypass. Remove the inlet/outlet union to access the turbine housing. Check for sand, scale, or plastic fragments blocking the turbine.
• Clean turbine: Rinse the turbine and housing with clean water. Ensure the turbine spins freely with a gentle puff of air or water.
• Check sensor connection: Locate the flow sensor cable on the valve head. Reseat the connector on both the sensor and control board. Inspect for cuts or crushed cable.
• Test sensor: With the unit powered, gently spin the turbine and observe if the display registers flow. If not, the Hall sensor is likely defective.
• Reinstall correctly: Ensure the turbine and sensor are installed in the correct orientation (flow direction arrow). Re-pressurize slowly and check for leaks.