Viessmann VITODENS 200-W Service Instructions Manual page 71

Fault codes
(cont.)
Fault Const. Weath.-
code on comp.
the dis-
play
C6 X
C7 X X
Cd X X
CE X X
CF X
dA X
db X
System char- Cause
acteristics
Control mode, Communica-
max. pump tion fault,
speed external vari-
able speed
heating circuit
pump, heat-
ing circuit with
mixer M2
Control mode, Communica-
max. pump tion fault,
speed external vari-
able speed
heating circuit
pump, heat-
ing circuit A1
Control mode Communica-
tion fault,
Vitocom 100
(KM BUS)
Control mode Communica-
tion fault, ext.
extension
Control mode Communica-
tion fault,
LON commu-
nication mod-
ule
Control mode Short circuit,
without room room temper-
influence ature sensor,
heating circuit
A1
Control mode Short circuit,
without room room temper-
influence ature sensor,
heating circuit
with mixer
M2
Troubleshooting
Measures
Check setting of
coding address
"E5".
Check setting of
coding address
"E5".
Check connec-
tions, Vitocom 100
and coding
address "95".
Check connections
and coding
address "2E".
Replace the LON
communication
module.
Check the room
temperature sen-
sor, heating circuit
A1.
Check the room
temperature sen-
sor, heating circuit
with mixer M2.
71