124
Dis-
played
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
bE
X
Control mode
without remote
control
Communica-
tion error,
Vitotrol re-
mote control,
heating circuit
3 (with mixer)
Check connec-
tions, cable, coding
address "A0" in
"Heating circuit"
group and remote
control settings
(see page 160).
For wireless re-
mote controls:
check radio path
connections, place
wireless remote
control and wire-
less repeater close
to the boiler. Check
KM BUS connec-
tion to wireless
base station. Re-
place the wireless
components.
bF
X
Control mode
Incorrect
LON commu-
nication mod-
ule
Replace LON com-
munication module
C1
X
X
Control mode
Communica-
tion error,
EA1 exten-
sion
Check connec-
tions
C2
X
X
Control mode
Communica-
tion error, so-
lar control
module or
Vitosolic
Check solar control
module or
Vitosolic
C3
X
X
Control mode
Communica-
tion error,
AM1 exten-
sion
Check connec-
tions
Troubleshooting
Fault codes
(cont.)
5585 174 GB