Viessmann VITOLADENS 300-W Installation And Service Instructions Manual page 100

Troubleshooting
Fault codes
(cont.)
Displayed System characteris-
fault code tics
C6 Control mode, max.
pump speed
C7 Control mode, max.
pump speed
C8 Control mode, max.
pump speed
Cd Control mode
CF Control mode
d6 Control mode
d7 Control mode
d8 Control mode
dA Control mode without
room influence
100
Cause
Communication er-
ror, external varia-
ble speed heating
circuit pump, heat-
ing circuit 2 (with
mixer)
Communication er-
ror, external varia-
ble speed heating
circuit pump, heat-
ing circuit 1 (with-
out mixer)
Communication er-
ror, external varia-
ble speed heating
circuit pump, heat-
ing circuit 3 (with
mixer)
Communication er-
ror, Vitocom 100
(KM BUS)
Communication er-
ror, LON communi-
cation module
Input DE1 at exten-
sion EA1 reports a
fault
Input DE2 at exten-
sion EA1 reports a
fault
Input DE3 at exten-
sion EA1 reports a
fault
Short circuit, room
temperature sen-
sor, heating circuit
1 (without mixer)
Measures
Check coding address
setting "E5" in "Heating
circuit" group.
Check coding address
setting "E5" in "Heating
circuit" group.
Check coding address
setting "E5" in "Heating
circuit" group.
Check connections,
Vitocom 100 and coding
address "95" in the "Gen-
eral" group.
Replace LON communi-
cation module
Remove fault at appliance
concerned
Remove fault at appliance
concerned
Remove fault at appliance
concerned
Check room temperature
sensor, heating circuit 1