Viessmann VG III - Page 32

32
Troubleshooting
Diagnostics (cont.)
Fault/behaviour
of the system
Flashing
code red
Cause Remedy
Combustion
errors through
pulsation
Start gas volume
too large or too
small
Adjust start gas volume
or opening characteristics
(see page 14)
p
Flue gas draught
incorrect
Check flue gas draught
(chimney)
CO is formed or
burner is very
sooty
Too little or too
much air
Correct setting.
Check boiler room
ventilation.
CO
2
content too
low or O
2
content too
high
Incorrect setting Adjust nozzle pressure in
accordance with type of
gas used.
Correct air damper
setting.
Infiltrating air Seal flue pipe at boiler
adaptor. Re-tighten boiler
door screws and those on
flue outlet cover.
Flue gas
temperature too
Gas throughput
too high
Match gas throughput to
rated boiler output
p
high
Boiler
contaminated
Clean boiler and correct
burner settings
5692Ă534ĂGB