Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 86

Troubleshooting
Fault codes
(cont.)
Fault code Const.
displayed
dF
E0
E1 X
E3 X
E4 X
E5 X
E6 X
E7 X
E8 X
86
Weather- System characteris-
comp. tics
X Control mode without
room influence
X Control mode
X Burner in a fault state Ionisation current
X Burner in a fault state Heat transfer too
X Burner blocked
X Burner blocked
X Burner blocked
X Burner in a fault state Ionisation current
X Burner in a fault state Ionisation current
Cause Measures
Lead break, room Check room temperature
temperature sen- sensor for heating circuit
sor, heating circuit 3 and remote control con-
3 (with mixer) figuration (see page 132)
External LON sub- Check connections and
scriber fault LON subscribers
Check gap between ioni-
too high during cal- sation electrode and burn-
ibration er gauze assembly (see
page 37).
In open flue operation,
prevent high incidence of
dust in the combustion air.
Press reset button R.
Ensure adequate heat
low during calibra- transfer.
tion. Press reset button R.
Temperature limiter
has shut down.
24 V power supply Replace control unit.
fault
Flame amplifier Replace control unit.
fault
System pressure Top up with water.
too low
Check ionisation elec-
too low during cali- trode:
bration Distance to burner
■
gauze assembly (see
page 37)
Electrode contamination
■
Connecting lead and
■
plug-in connections
Check flue system; reme-
dy flue gas recirculation if
required.
Press reset button R.
Check gas supply (gas
lies outside the pressure and gas flow
permissible range switch), gas train and
connection pipe.
Check assignment of gas
type (see page 31).
Check ionisation elec-
trode:
Distance to burner
■
gauze assembly (see
page 37)
Electrode contamination
■
Press reset button R.