Viessmann Vitodens 200-W Installation And Service Instructions Manual page 133

Fault codes
(cont.)
Dis- Const.
played
fault
code
F3 X
F6 X
F8 X
F9 X
FA X
FC X
Weath.- System char-
comp. acteristics
X Burner in a fault
state
X Burner in a fault
state
X Burner in a fault
state
X Burner in a fault
state
X Burner in a fault
state
X Burner in a fault
state
Troubleshooting
Cause Measures
Flame signal Check ionisation
is already electrode and con-
present at necting cable.
burner start Press reset button
R.
Boiler water Replace boiler wa-
temperature ter temperature
sensor tem- sensors.
perature val-
ues vary too
widely from
one another
Fuel valve Check gas train.
closes too Check both control
late paths.
Press reset button
R.
Fan speed Check fan, fan con-
too low during necting cables and
burner start power supply;
check fan control.
Press reset button
R.
Fan not at Check fan, fan con-
standstill necting cables and
fan control.
Press reset button
R.
Gas train faul- Check gas train.
ty, faulty mod- Check flue sys-
ulation valve tem.
control or flue Press reset button
gas path R.
blocked
133