Fault
code
on the
display
Const.
weath.-
comp.
System char-
acteristics
Cause
Measures
C5
X
X
Control mode,
max. pump
speed
Communica-
tion fault,
variable
speed inter-
nal pump
Check the setting
of coding address
"30"
C6
X
Control mode,
max. pump
speed
Communica-
tion fault
–
external vari-
able speed
heating cir-
cuit pump,
heating
circuit M2
Check setting of
coding address
"E5"
C7
X
X
Control mode,
max. pump
speed
Communica-
tion fault
–
external vari-
able speed
heating cir-
cuit pump,
heating
circuit A1
Check setting of
coding address
"E5"
Cd
X
X
Control mode
Communica-
tion fault
Vitocom 100
(KM BUS)
Check connec-
tions, Vitocom 100
and coding ad-
dress "95".
CE
X
X
Control mode
Communica-
tion fault
–
ext. exten-
sion
Check connec-
tions and coding
address "2E".
CF
X
Control mode
Communica-
tion fault,
LON com-
munication
module
Replace the LON
communication
module.
dA
X
Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit A1
shorted out
Check the room
temperature sen-
sor, heating cir-
cuit A1.
Fault codes
(cont.)
77
Troubleshooting
5692
673
GB
Summary of Contents for VITODENS 300-W
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