Viessmann Vitoflame 100 Service Instructions Manual page 28

Troubleshooting
Diagnosis
(cont.)
Fault
CO content too
2
low
Excessive flue gas
temperature
Burner operates,
constant red flicker-
ing light on the
burner control unit
28
Cause
Incorrect setting
Infiltrating air
Excessive oil throughput
Boiler contaminated
Air in flue gas heat
exchanger
No fault, interface diagnosis
Measures
Check setting (see chapter
"Standard values for burner
settings")
Seal flue pipe at boiler flue out-
let. Re-tighten the combustion
chamber cover screws and
those on the flue outlet cover.
Match oil throughput to rated
boiler output
Clean boiler and correct burner
settings
Vent flue gas heat exchanger
Press reset button >3 s until
LED illuminates yellow, then
release button