What to check if there is no system circulation

If there is no system circulation on a Grant Solar Thermal System, heating engineers should check for the following:

  • Check whether the pump is operating or not (please refer to the manual for the Grant Solar Thermal Pump Station for support here)
  • If the pump is noisy, this may suggest that there is air in the system
  • Check whether the pump may be air locked and needs venting - let the pump run and the pump vents itself over time
  • Check if the valves are closed - ensure that the Flow and Return valves are fully open. If filling or flushing the system, ensure the Filling/Shut off valves are fully open.

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