Viessmann VITODENS 200-W Service Instructions Manual page 78

Troubleshooting
Fault codes
(cont.)
Fault Const.
code on
the dis-
play
C6
C7 X
Cd X
CE X
CF
dA
db
78
weath.- System char-
comp. acteristics
X Control mode,
max. pump
speed
X Control mode,
max. pump
speed
X Control mode
X Control mode
X Control mode
X Control mode
without room
influence
X Control mode
without room
influence
Cause Measures
Communica- Check setting of
tion fault, var- coding address
iable speed "E5"
circulation
pump, heat-
ing circuit M2
Communica- Check setting of
tion fault, var- coding address
iable speed "E5"
circulation
pump, heat-
ing circuit A1
Communica- Check connections
tion fault and the
Vitocom 100 Vitocom 100
(KM BUS)
Communica- Check connections
tion fault –
and settings of
coding address
ext. exten-
"2E"
sion
Communica- Replace the LON
tion fault, communication
LON commu- module
nication mod-
ule
Room tem- Check the room
perature sen- temperature sen-
sor, heating sor, heating circuit
circuit A1 A1
shorted out
Room tem- Check the room
perature sen- temperature sen-
sor, heating sor, heating circuit
circuit with with mixer M2
mixer M2
shorted out