Safety first: Isolate water and power. Depressurise the system by opening a tap before removing any valve components.

Verify symptom: Run a tap and check the display. If the flow indicator does not move or usage does not register, the meter is not working.
Access flow meter: On many Aqua Dial valves, the turbine and sensor are located in a side port or integrated into the valve body. Remove the retaining clip or screws as per the service manual.
Inspect and clean turbine: Carefully remove the turbine wheel. Rinse under running water and remove any grit or scale. Ensure it spins freely on its shaft.
Check sensor and wiring: Inspect the Hall sensor and its cable for damage. Reseat the connector on the control board.
Reassemble and test: Refit the turbine and sensor, restore water and power, and run water through the system. Confirm that the flow indicator on the display responds.
Replace meter assembly: If there is still no flow signal, replace the Aqua Dial flow meter/turbine assembly.

E05 displayed and the unit does not detect water flow or does not meter usage

Possible Causes