Viessmann VITOCROSSAL 200 CM2 Service Instructions For Contractors page 45

Faults without fault display
Fault
Combustion faults due to
pulsation
Thermo-acoustics/combus-
tion noise
CO content too low
2
CO formation or burner is
very sooty.
Flame tears off during opera-
tion
Cause of fault
Excessive gas throughput
Insufficient or excessive air
Condensate backed up in flue
system
Flue outlet not installed correctly Check flue outlet and flue system.
Incorrect CO settings; insuffi-
2
cient or excessive air
Incorrect setting
Insufficient or excessive air
Insufficient draught in flue sys-
tem
Intake strainer of gas train con-
taminated
Measure
Adjust gas throughput in accordance with the
rated boiler heating output.
Check condensate drain.
Adjust burner in accordance with the details on
page 21 onwards.
Check whether the burner has been set to the
correct gas type; change gas restrictor if neces-
sary (see page 13 onwards).
Adjust burner in accordance with the details on
page 21 onwards.
Correct the settings. Check ventilation in instal-
lation room.
Check flue system.
Remove flange and clean strainer.
Troubleshooting
45