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Faults without fault display
Fault
CO
content too low
2
CO formation or burner is
very sooty.
Flame tears off during op-
eration.
Flue gas temperature too
high
(cont.)
Cause of fault
Incorrect setting
Insufficient or excessive air
Insufficient draught in flue
system
Intake strainer of gas train
soiled
Excessive gas throughput
Insufficient water pressure
Measure
Check whether the burner has been adjusted to the
correct gas type; change gas restrictor if required
(see page 11 onwards).
Adjust burner in accordance with the details on
page 16 onwards.
Correct the settings. Check ventilation in installation
room.
Check flue system.
Remove flange. Clean strainer. See page 27.
Adjust gas throughput in accordance with the rated
boiler heating output. Checking the condition of the
heating surfaces. Clean if necessary.
Increase water pressure. Check minimum pressure
limiter setting.
Troubleshooting
43
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