47
Fault
Cause of fault
Measure
CO
2
content too low
Incorrect setting
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.
CO formation or burner
is very sooty.
Insufficient or too much air
Correct the settings. Check ventilation in installation
room.
Insufficient draught in flue sys-
tem
Check flue system.
Flame tears off during
operation.
Intake strainer of gas train
soiled
Remove flange and clean strainer. See page 31.
Flue gas temperature
too high
Gas throughput too high.
Boiler contaminated; insuffi-
cient boiler water pressure
available.
Adjust gas throughput in accordance with the rated
boiler heating output. Check condition of heating surfa-
ces. Clean if required. Check boiler for deposits on the
heating water side (scaling).
Clean boiler. Increase the boiler water pressure.
Troubleshooting
Faults without fault display
(cont.)
5831036
Diagnosis