External Filling Loop - Worcester GREENSTAR i SYSTEM User Manual
Wall hung rsf gas fired condensing system boiler
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SYSTEM PRESSURE
4.2
EXTERNAL FILLING LOOP
Once the external filling loop has been located, follow the instructions for re-pressurising.
1. Unscrew blanking cap.
2. Attach hose and screw on hand-tight to valve.
3. Turn the handle/screwdriver slot point 90° to open the valves.
4. The handle/screwdriver slot point will be in-line with the valves
4.
4.
3.
3.
1.
2.
6720643356-12.1Wo
Fig. 7
External filling loop
5. When the pressure reaches between the 1 and 1.5 bar marks, turn the handle/screwdriver slot point
back to close it.
6. Remove the hose and replace the blanking cap.
12
6 720 644 864a (2010/10)
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Questions and answers
I can’t get my green star I to stay operating it keeps turning off
The Worcester Greenstar i System boiler may keep turning off due to several possible reasons:
1. No Power – Check if the boiler has a permanent mains supply. Inspect Fuse F1 (2.5A) or Fuse F3 (0.5A) and the transformer. If faulty, replace the control board.
2. No Live Demand – Ensure there is a live demand at ST10-L from an external room thermostat or timer. Some older thermostats may not return proper voltage.
3. Diverter Valve Issue – If the boiler operates without a live demand signal, check that no permanent live feed is present at ST10-L from another source.
4. Incorrect Piping – Ensure the cold inlet and DHW outlet are correctly piped and not crossed.
5. Flow Turbine Issue – If the boiler is not operating during hot water demand, test the flow turbine.
Further troubleshooting may require checking the control board and other electrical components.
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