Viessmann Vitodens 222-F Installation And Service Instructions Manual page 91

Fault codes
(cont.)
Fault code dis- System characteristics
played
D6 Control mode
D7 Control mode
D8 Control mode
DA Control mode without room
influence
DB Control mode without room
influence
DC Control mode without room
influence
DD Control mode without room
influence
DE Control mode without room
influence
DF Control mode without room
influence
E0 Control mode
E2 Burner in a fault state
E3 Burner in a fault state
E4 Burner blocked
E5 Burner blocked
E8 Burner in a fault state
Cause
Input DE1 at EA1 exten-
sion reports a fault.
Input DE2 at EA1 exten-
sion reports a fault.
Input DE3 at EA1 exten-
sion reports a fault.
Short circuit, room tem-
perature sensor, heating
circuit 1 (without mixer)
Short circuit, room tem-
perature sensor, heating
circuit 2 (with mixer)
Short circuit, room tem-
perature sensor, heating
circuit 3 (with mixer)
Lead break, room temper-
ature sensor, heating cir-
cuit 1 (without mixer)
Lead break, room temper-
ature sensor, heating cir-
cuit 2 (with mixer)
Lead break, room temper-
ature sensor, heating cir-
cuit 3 (with mixer)
External LON subscriber
error
No calibration as flow rate
too low
Heat transfer too low dur-
ing calibration
Temperature limiter has
shut down.
24 V power supply fault
Flame amplifier fault
Ionisation current lies out-
side the permissible range
Troubleshooting
Measures
Remedy fault at affected appliance.
Remedy fault at affected appliance.
Remedy fault at affected appliance.
Check room temperature sensor,
heating circuit 1.
Check room temperature sensor,
heating circuit 2.
Check room temperature sensor,
heating circuit 3.
Check room temperature sensor,
heating circuit 1 and remote control
settings (see page 113)
Check room temperature sensor,
heating circuit 2 and remote control
settings (see page 113)
Check room temperature sensor,
heating circuit 3 and remote control
settings (see page 113)
Check connections and LON sub-
scribers.
Ensure adequate heat transfer.
Press reset button R.
Ensure adequate heat transfer.
Press reset button R.
Replace control unit.
Replace control unit.
Check gas supply (gas pressure
and gas flow switch), gas train and
connecting cable.
Check assignment of gas type (see
page 35).
Check ionisation electrode:
Distance to burner gauze assem-
■
bly (see page 41)
Electrode contaminated
■
Press reset button R.
91