Operating instructions

119
Dis-
played
fault
code
Const. Weath.-
comp.
System char-
acteristics
Cause Measures
C5 X X Control mode,
max. pump
speed
Communica-
tion error, var-
iable speed
internal pump
Check setting of
coding address
"30" in group "Boil-
er" (weather-com-
pensated control
units) or group 2
(constant tempera-
ture control units)
C6 X Control mode,
max. pump
speed
Communica-
tion error, ex-
ternal varia-
ble speed
heating circuit
pump,
heating circuit 2
(with mixer)
Check coding ad-
dress setting "E5"
in group "Heating
circuit"
C7 X X Control mode,
max. pump
speed
Communica-
tion error, ex-
ternal varia-
ble speed
heating circuit
pump,
heating circuit 1
(without mix-
er)
Check coding ad-
dress setting "E5"
in group "Heating
circuit"
C8 X Control mode,
max. pump
speed
Communica-
tion error, ex-
ternal varia-
ble speed
heating circuit
pump,
heating circuit 3
(with mixer)
Check coding ad-
dress setting "E5"
in group "Heating
circuit"
Troubleshooting
Fault codes
(cont.)
5772 909 GB
Service