Boiler Frost Protection; Setting The Hot Water Temperature - Worcester GREENSTAR i SYSTEM User Manual
Wall hung rsf gas fired condensing system boiler
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3.1.2 BOILER FROST PROTECTION
If the temperature within the boiler falls below 8°C the pump will run to circulate water and prevent
the system freezing.
If the temperature within the boiler falls below 5°C the boiler will fire periodically, bringing the boiler
temperature up to 12°C to avoid the possibility of the system freezing.
This process will be repeated until such time that the boiler temperature does not drop below 5°C.
3.1.3 SETTING THE HOT WATER TEMPERATURE
Optional integral diverter valve kit with cylinder temperature sensor is required to be able
to set the hot water temperature.
Otherwise the temperature is factory set to approximately 55°C.
1. Turn the hot water temperature control knob to the desired level.
2. The Eco button is non operational with this type of boiler.
Fig. 4
Hot water temperature
4
3
5
2
1
6
max
6 720 644 864a (2010/10)
2.
4
3
e
2
1.
1
min
max
6720644864-01.1Wo
CONTROLS
reset
eco
6
9
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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.
This answer is automatically generated