Viessmann VITODENS 222-F Installation And Service Instructions Manual page 98

Troubleshooting
Fault codes
(cont.)
Fault Const. Weath.-
code on comp.
the dis-
play
F0 X X
F1 X X
F2 X X
F3 X X
F4 X X
98
System char- Cause
acteristics
Burner blocked Internal fault
Burner in a fault Flue gas tem-
state perature lim-
iter has
responded.
Burner in a fault The tempera-
state ture limiter
has respon-
ded
Burner in a fault Flame signal
state is already
present at
burner start
Burner in a fault No flame sig-
state nal
Measures
Replace the control
unit.
Check the heating
system fill level.
Vent the system.
Press reset button
R after the flue sys-
tem has cooled
down.
Check the heating
system fill level.
Check the circula-
tion pump. Vent the
system. Check the
temperature limiter
and connecting
cables.
Press reset button
R.
Check the ionisa-
tion electrode and
connecting cable.
Press reset button
R.
Check the ionisa-
tion electrode and
connecting cable,
measure the ioni-
sation current,
check the gas
pressure, check
the gas train, igni-
tion, ignition mod-
ule, ignition elec-
trodes and the con-
densate drain.
Press reset button
R.