Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 95

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
E1 Burner in a fault state
E2 Burner in a fault state
E3 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
Ionisation current too high
during calibration
No calibration as flow rate
too low
Heat transfer too low dur-
ing calibration
Temperature limiter has
shut down.
Troubleshooting
Measures
Remove fault at appliance con-
cerned
Remove fault at appliance con-
cerned
Remove fault at appliance con-
cerned
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 141)
Check room temperature sensor,
heating circuit 2 and remote control
settings (see page 141)
Check room temperature sensor,
heating circuit 3 and remote control
settings (see page 141)
Check connections and LON sub-
scribers
Check gap between ionisation
electrode and burner gauze as-
sembly (see page 43).
Check whether there is a lot of
dust in the ventilation air (e.g. from
construction work).
Note
Deposits on the electrodes indicate
foreign bodies in the ventilation air.
Check the installation room and
flue system for causes of the de-
posits. For example: laundry deter-
gents, cleaning agents, toiletries,
deposits in the ventilation air sup-
ply (chimney).
If burner gauze assembly and ioni-
sation electrode have been re-
placed, also clean fan unit, gas/air
channel and Venturi extension.
Ensure adequate heat transfer.
Press reset button R.
Ensure adequate heat transfer.
Check circulation pump for faults,
scale or blockages.
Press reset button R.
95