Viessmann VITODENS 200-W Service Instructions Manual page 106

Troubleshooting
Fault codes
(cont.)
Dis- Const. Weath.-
played comp.
fault
code
EF X X
F0 X X
F1 X X
F2 X X
F3 X X
106
System char- Cause
acteristics
Burner in a fault The flame is
state lost immedi-
ately after it
has built (dur-
ing the safety
time)
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
Measures
Check the gas sup-
ply (gas pressure
and gas flow lim-
iter), check the flue
gas/ventilation air
system for flue gas
recirculation,
check the ionisa-
tion electrode
(replace if
required).
Press reset button
R.
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.