Viessmann Vitodens 200 Service Instructions Manual page 72

Troubleshooting
Fault codes
(cont.)
Display Const. Weath.-
fault comp.
code
bA X
bC X
bd X
bE X
bF X
C2 X X
72
System char- Cause
acteristics
Mixer M2 reg- Communica-
ulates to a tion fault -
flow tempera- extension kit
ture of 20 °C. for heating
circuit with
mixer M2
Control mode Communica-
without remote tion fault -
control Vitotrol re-
mote control,
heating cir-
cuit A1
Control mode Communica-
without remote tion fault -
control Vitotrol re-
mote control,
heating cir-
cuit with
mixer M2
Control mode Vitotrol re-
mote control
incorrectly
encoded
Control mode Incorrect
LON com-
munication
module
Control mode KM BUS
connection
break to
solar heating
control unit
Measures
Check the exten-
sion kit connec-
tions and coding.
Start the exten-
sion kit.
Check connec-
tions, cable, cod-
ing address "A0"
and the remote
control DIP
switches.
Check connec-
tions, cable, cod-
ing address "A0"
and the remote
control DIP
switches.
Check remote
control DIP switch
settings (see
page 99).
Replace the LON
communication
module.
Check the KM
BUS, the solar
heating control
unit and coding
address "54".