66
Fault code
on the dis-
play
System characteris-
tics
Cause
Measures
C5
Control mode, max.
pump speed
Communication
fault, variable
speed internal cir-
culation pump
Check the setting of cod-
ing address "30".
C6
Control mode, max.
pump speed
Communication
fault, external vari-
able speed heating
circuit pump, heat-
ing circuit with
mixer M2
Check the setting of cod-
ing address "E5".
C7
Control mode, max.
pump speed
Communication
fault, external vari-
able speed heating
circuit pump, heat-
ing circuit A1
Check the setting of cod-
ing address "E5".
Cd
Control mode
Communication
fault, Vitocom 100
(KM BUS)
Check connections,
Vitocom 100 and coding
address "95".
CE
Control mode
Communication
fault, ext. exten-
sion
Check connections and
coding address "2E".
CF
Control mode
Communication
fault, LON commu-
nication module
Replace the LON commu-
nication module.
dA
Control mode without
room influence
Short circuit, room
temperature sen-
sor, heating circuit
A1
Check the room tempera-
ture sensor, heating cir-
cuit A1.
db
Control mode without
room influence
Short circuit, room
temperature sen-
sor, heating circuit
with mixer M2
Check the room tempera-
ture sensor, heating cir-
cuit with mixer M2.
dd
Control mode without
room influence
Lead break, room
temperature sen-
sor, heating circuit
A1
Check the room tempera-
ture sensor, heating cir-
cuit A1 and the remote
control DIP switch set-
tings (see page 88).
Troubleshooting
Fault codes
(cont.)
5692 799 GB
Summary of Contents for VITOLADENS 300-W
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