Viessmann VITODENS 200-W Service Instructions Manual page 76

Troubleshooting
Fault codes
(cont.)
Fault Const. Weath.-
code comp.
on the
display
bF X
C2 X X
C5 X X
C6 X
C7 X X
Cd X X
CE X X
76
System char- Cause
acteristics
Control mode Incorrect
LON com-
munication
module
Control mode Communica-
tion fault,
solar control
unit
Control mode, Communica-
max. pump tion fault,
speed variable
speed circu-
lation pump
in the heat-
ing circuit
connection
set
Control mode, Communica-
max. pump tion fault,
speed variable
speed circu-
lation pump,
heating
circuit M2
Control mode, Communica-
max. pump tion fault,
speed variable
speed circu-
lation pump,
heating
circuit A1
Control mode Communica-
tion fault
Vitocom 100
(KM BUS)
Control mode Communica-
tion fault -
ext. exten-
sion
Measures
Replace the LON
communication
module.
Check connec-
tions and coding
address "54".
Check the setting
of coding address
"30"
Check setting of
coding address
"E5"
Check setting of
coding address
"E5"
Check connec-
tions and the
Vitocom 100.
Check connec-
tions and settings
of coding address
"2E".