Viessmann VITOCROSSAL 200 Service Instructions Manual page 47

Diagnosis
(cont.)
Fault
Whining noises
CO content too low
2
CO is formed or burner is
very sooty
Excessive flue gas tem-
perature
Cause
Incorrect CO settings;
2
air shortage or excess
Incorrect setting
Too little or too much air
Insufficient draught in
the flue gas system
Excessive gas through-
put
Troubleshooting
Remedy
Adjust the burner in ac-
cordance with the details
on page 13.
Check that burner has
been adjusted for the cor-
rect gas type and change
the gas restrictor, if re-
quired (see from
page 10).
Adjust the burner in ac-
cordance with the details
on page 13.
Adjust correctly. Check
the ventilation of the in-
stallation room.
Check the flue gas sys-
tem.
Adjust the gas throughput
in accordance with the
rated boiler output (see
supply values, page 66).
Check the condition of
the secondary heating
surfaces of the boiler and
clean them, if required.
47