Viessmann Vitodens 200 Service Instructions Manual page 73

Fault codes
(cont.)
Display Const. Weath.-
fault comp.
code
C6 X
C7 X X
Cd X X
CE X X
CF X
dA X
System char- Cause
acteristics
Control mode, Communica-
max. pump tion fault -
speed external vari-
able speed
heating cir-
cuit pump,
heating cir-
cuit with
mixer M2
Control mode, Communica-
max. pump tion fault -
speed external 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
Control mode Room tem-
without room perature
influence sensor, heat-
ing circuit A1
shorted out
Troubleshooting
Measures
Check coding ad-
dress "E5" set-
tings; check the
DIP switch set-
tings in the pump
wiring box:
Switch 1: OFF
Switch 2: ON
Check coding ad-
dress "E5" set-
tings; check the
DIP switch set-
tings in the pump
wiring box:
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.
Check the room
temperature sen-
sor, heating cir-
cuit A1.
73