Fault Finding - Worcester GREENSTAR i SYSTEM User Manual
Wall hung rsf gas fired condensing system boiler
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7
FAULT FINDING
If a boiler fault occurs, please read the following page thoroughly before contacting Worcester, Bosch
Group.
Problem
Desired room temperature is
not reached
Desired room temperature
exceeded by large amount
Heating stays on for too long
No ON/OFF mains indicator
Hot water temperature too
low
Hot water temperature too
high
Tab. 2
Cause
Thermostatic radiator valve(s)
set too low
Temperature control for
central heating flow on boiler
set too low
Air trapped in heating system
Radiators are too hot
Clock is incorrectly set
Momentary power failure
Temperature set too low
Temperature set too high
6 720 644 864a (2010/10)
FAULT FINDING
Remedy
B Increase thermostatic
radiator valve setting(s)
B Increase central heating
flow temperature control
setting
B Bleed radiators and
recharge heating system
B Turn down thermostatic
radiator valves/room
thermostat
B Reduce central heating
temperature by turning
down the Central Heating
control on boiler
B Check setting and adjust
B Switch off boiler at master
switch, wait a few seconds
then switch on again
B Check setting and adjust
B Check setting and adjust
15
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Do you have a question about the GREENSTAR i SYSTEM and is the answer not in the manual?
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