Viessmann Vitoflame 100 Service Instructions Manual page 31

Diagnostics
(cont.)
Fault/ Flash−
characteristics ing
code
red
7 ×
Flame tears
off during g
operation i
7 ×
Combustion
fault through g
l i
pulsation
CO is formed
or burner is
very sooty
CO content
2
too low or O
2
content too
high
Flue gas
temperature p
too high hi h
Cause
Mixer assembly
contaminated
Air damper
incorrectly
positioned
Gas throughput too
high
Mixer assembly
(stage 2) incorrectly
adj.
Air damper
incorrectly
positioned
Combustion
chamber pressure
is too high
Start gas volume
too large or too
small
Incorrect flue pipe
Air shortage or
surplus
Incorrect
adjustment
Infiltrating air
Gas throughput too
high
Boiler
contaminated
Troubleshooting
Measure
Clean mixer assembly
Correct the switch cam
adjustment at the air damper
motor
(see page 9)
Adjust the gas throughput in
acc. with rated boiler output
Change the mixer assembly
adjustment (see page 44 to 46)
Correct the switch cam
adjustment at the air damper
motor (see page 9)
Check the pressure in the
combustion chamber; clean the
boiler, if required
Adjust start gas volume or
opening characteristics (see
page 14)
Check flue pipe (chimney)
Correct setting. Check the
ventilation of the boiler room.
Adjust the nozzle pressure in
accordance with the type of gas
used. Correct air damper
setting.
Seal flue pipe at the flue outlet.
Re−tighten the boiler door
screws and those on the flue
outlet cover.
Match gas throughput to the
rated boiler output
Clean boiler and correct burner
settings
31