Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 134

Troubleshooting
Fault codes
(cont.)
Dis- Const.
played
fault
code
EF X
F0 X
F1 X
F2 X
134
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 switch).
formed (dur- Check balanced
ing the safety flue system for flue
time) gas recirculation.
Check ionisation
electrode (replace
if necessary):
■ Distance to burn-
er gauze assem-
bly (see page 52)
■ Contamination of
electrode
Press reset button
R
Replace control
unit
Flue gas tem- Check heating sys-
perature limit- tem fill level. Vent
er has re- the system.
sponded Press reset button
R after flue system
has cooled down
Temperature Check heating sys-
limiter has re- tem fill level. Check
sponded circulation pump.
Vent the system.
Check temperature
limiter and con-
necting cables.
Press reset button
R