Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 91

Fault codes
(cont.)
Fault code dis- System characteristics
played
B1 Control mode as per deliv-
ered condition
B4 Regulates as if the outside
temperature were 0 °C.
B5 Control mode as per deliv-
ered condition
B7 Burner blocked
B8 Burner blocked
BA Mixer regulates to 20 °C flow
temperature.
BB Mixer regulates to 20 °C flow
temperature.
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
Cause
Communication error, pro-
gramming unit
Internal fault
Internal fault
Boiler coding card fault
Lead break, flue gas tem-
perature sensor
Communication error, ex-
tension kit for heating cir-
cuit 2 (with mixer)
Communication error, ex-
tension kit for heating cir-
cuit 3 (with mixer)
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
Troubleshooting
Measures
Check connections and replace
programming unit if necessary.
Replace control unit.
Replace control unit.
Plug in or replace the boiler coding
card.
Check flue gas temperature sensor
(see page 99).
Check extension kit connections
and code.
Check extension kit connections
and code.
Check connections, cable, coding
address "A0" in the "Heating cir-
cuit..."/5 group and remote control
configuration (see page 113).
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 (see page 113).
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 (see page 113).
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 the OpenTherm extension.
Check setting of coding address
"30" in the "Boiler"/2 group.
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