Fault
code
on the
display
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
C5
X
X
Control mode,
max. pump
speed
Communica-
tion error
–
variable
speed inter-
nal pump
Check coding ad-
dress "30" set-
tings; check the
DIP switch set-
tings in the pump
wiring chamber:
Switch 1: OFF,
switch 2: ON
C6
X
Control mode,
max. pump
speed
Communica-
tion fault, ex-
ternal vari-
able speed
heating cir-
cuit pump,
heating
circuit M2
Check coding ad-
dress "E5" set-
tings; check the
DIP switch set-
tings in the pump
wiring chamber:
Switch 1: OFF,
switch 2: ON
C7
X
X
Control mode,
max. pump
speed
Communica-
tion fault, ex-
ternal vari-
able speed
heating cir-
cuit pump,
heating
circuit A1
Check coding ad-
dress "E5" set-
tings; check the
DIP switch set-
tings in the pump
wiring chamber:
Switch 1: ON,
Switch 2: OFF
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
Fault codes
(cont.)
78
Troubleshooting
5692
731
GB
Summary of Contents for VITODENS 333-F WS3A
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