Viessmann VITODENS 333-F WS3A Service Instructions Manual page 78

Troubleshooting
Fault codes
(cont.)
Fault Const. Weath.-
code comp.
on the
display
C5 X X
C6 X
C7 X X
Cd X X
CE X X
CF X
78
System char- Cause
acteristics
Control mode, Communica-
max. pump tion error
speed variable
speed inter-
nal pump
Control mode, Communica-
max. pump tion fault, ex-
speed ternal vari-
able speed
heating cir-
cuit pump,
heating
circuit M2
Control mode, Communica-
max. pump tion fault, ex-
speed ternal vari-
able speed
heating cir-
cuit pump,
heating
circuit A1
Control mode Communica-
tion fault
Vitocom 100
(KM BUS)
Control mode Communica-
tion fault,
ext. exten-
sion
Control mode Communica-
tion fault,
LON com-
munication
module
Measures
Check coding ad-
dress "30" set-
tings; check the
DIP switch set-
tings in the pump
wiring chamber:
Switch 1: OFF,
switch 2: ON
Check coding ad-
dress "E5" set-
tings; check the
DIP switch set-
tings in the pump
wiring chamber:
Switch 1: OFF,
switch 2: ON
Check coding ad-
dress "E5" set-
tings; check the
DIP switch set-
tings in the pump
wiring chamber:
Switch 1: ON,
Switch 2: OFF
Check connec-
tions, Vitocom 100
and coding ad-
dress "95"
Check connec-
tions and coding
address "2E"
Replace the LON
communication
module