Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 92

Troubleshooting
Fault codes
(cont.)
Fault code dis- System characteristics
played
CD Control mode
CF Control mode
No communication via LON.
D4 Control mode
Burner is operating with a
limited modulation range.
D5 Burner in a fault state
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
E6 Burner blocked
92
Cause
Communication error,
Vitocom 100
Communication error,
LON communication mod-
ule
No air flow detected in fan
unit.
Fan blocked
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
System pressure too low
Measures
Check connections and
Vitocom 100 (see separate installa-
tion and service instructions).
Without Vitocom 100: set code
"95:0" in the "General"/1 group.
Check LON communication mod-
ule and replace if required.
If no LON communication module
is installed, set code "76:0" in the
"General"/1 group.
Check the mass flow sensor at the
fan unit. Check the flue system for
flue gas back pressure.
Press reset button R.
Check free movement of the impel-
ler. Replace the fan unit if required.
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
configuration (see page 113).
Check room temperature sensor,
heating circuit 2 and remote control
configuration (see page 113).
Check room temperature sensor,
heating circuit 3 and remote control
configuration (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.
Top up with water.