Viessmann Vitodens 222-F Installation Instructions For Contractors page 63

Fault codes
(cont.)
Fault code dis- System characteristics
played
BC Control mode without remote
control
BD Control mode without remote
control
BE Control mode without remote
control
BF Control mode
C1 Control mode
C3 Control mode
C4 Control mode
C5 Control mode, max. pump
speed
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
Cause
Communication error,
Vitotrol remote control,
heating circuit 1 (without
mixer)
Communication error,
Vitotrol remote control,
heating circuit 2 (with mix-
er)
Communication error,
Vitotrol remote control,
heating circuit 3 (with mix-
er)
Incorrect LON communi-
cation module
Communication error, EA1
extension
Communication error,
AM1 extension
Communication error,
OpenTherm extension
Communication error, in-
ternal variable speed
pump
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
Troubleshooting
Measures
Check connections, cable, coding
address "A0" in the "Heating cir-
cuit..."/5 group and remote control
configuration.
For wireless remote control units:
check connection; place remote
control close to the boiler.
Check connections, cable, coding
address "A0" in the "Heating cir-
cuit..."/5 group and remote control
configuration.
For wireless remote control units:
check connection; place remote
control close to the boiler.
Check connections, cable, coding
address "A0" in the "Heating cir-
cuit..."/5 group and remote control
configuration.
For wireless remote control units:
check connection; place remote
control close to the boiler.
Replace LON communication mod-
ule
Check connections
Without EA1 extension:
set code "5b:0" in the "General"/1
group.
Check connections
Without AM1 extension:
set code "32:0" in the "General"/1
group.
Check OpenTherm extension
Check setting of coding address
"30" in the "Boiler"/2 group
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.
Remove fault at appliance con-
cerned
63