Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 135

Fault codes
(cont.)
Dis- Const.
played
fault
code
F3 X
F8 X
F9 X
FA X
FC X
Fd 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 and addi-
tional fault b7 is
displayed
Troubleshooting
Cause Measures
Flame signal Check ionisation
is already electrode and con-
present at necting cable.
burner start Press reset button
R
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 in idle Check fan, fan con-
state 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
Boiler coding Insert the boiler
card is miss- coding card.
ing Press reset button
R
Replace control
unit if fault persists
135