Viessmann VITODENS 222-F Installation And Service Instructions Manual page 116

Troubleshooting
Fault codes
(cont.)
Dis- Const.
played
fault
code
EF X
F0 X
F1 X
F2 X
116
Weath.- System char-
comp. acteristics
X Burner in a fault
state
X Burner blocked Internal fault
X Burner in a fault
state
X Burner in a fault
state
Cause Measures
Flame is lost Check gas supply
immediately (gas pressure and
after it has gas flow limiter).
built (during Check flue gas/
the safety ventilation air sys-
time). tem for flue gas
recirculation.
Check ionisation
electrode (replace
if required):
■ Distance to
burner gauze
assembly (see
page 38)
■ Contamination of
electrode
Press reset button
R.
Replace control
unit.
Flue gas tem- Check heating sys-
perature lim- tem fill level. Vent
iter has the system.
responded. Press reset button
R after flue system
has cooled down.
Temperature Check heating sys-
limiter has tem fill level. Check
responded. circulation pump.
Vent the system.
Check temperature
limiter and con-
necting cables.
Press reset button
R.