73
Fault code dis-
played
System characteristics
Cause
Measures
BC
Control mode without remote
control
Communication error,
Vitotrol remote control,
heating circuit 1 (without
mixer)
Check connections, cable and cod-
ing address
"A0"
in the
"Heating
circuit"
group and the remote con-
trol settings. For wireless remote
control units: Check connection;
place remote control close to the
boiler.
BD
Control mode without remote
control
Communication error,
Vitotrol remote control,
heating circuit 2 (with mix-
er)
Check connections, cable and cod-
ing address
"A0"
in the
"Heating
circuit"
group and the remote con-
trol settings. For wireless remote
control units: Check connection;
place remote control close to the
boiler.
BE
Control mode without remote
control
Communication error,
Vitotrol remote control,
heating circuit 3 (with mix-
er)
Check connections, cable and cod-
ing address
"A0"
in the
"Heating
circuit"
group and the remote con-
trol settings. For wireless remote
control units: Check connection;
place remote control close to the
boiler.
BF
Control mode
Incorrect LON communi-
cation module
Replace LON communication mod-
ule.
C1
Control mode
Communication error, EA1
extension
Check connections.
C2
Control mode
Communication error, so-
lar control module or
Vitosolic
Check solar control module or
Vitosolic.
C3
Control mode
Communication error,
AM1
Check connections.
CF
Control mode
Communication error,
LON communication mod-
ule
Replace LON communication mod-
ule.
D6
Control mode
Input DE1 at EA1 exten-
sion reports a fault.
Remedy fault at appliance con-
cerned.
D7
Control mode
Input DE2 at EA1 exten-
sion reports a fault.
Remedy fault at appliance con-
cerned.
D8
Control mode
Input DE3 at EA1 exten-
sion reports a fault.
Remedy fault at appliance con-
cerned.
DA
Control mode without room
influence
Short circuit, room tem-
perature sensor, heating
circuit 1 (without mixer)
Check room temperature sensor,
heating circuit 1.
DB
Control mode without room
influence
Short circuit, room tem-
perature sensor, heating
circuit 2 (with mixer)
Check room temperature sensor,
heating circuit 2.
DC
Control mode without room
influence
Short circuit, room tem-
perature sensor, heating
circuit 3 (with mixer)
Check room temperature sensor,
heating circuit 3.
DD
Control mode without room
influence
Lead break, room temper-
ature sensor, heating cir-
cuit 1 (without mixer)
Check room temperature sensor
for heating circuit 1 and the remote
control settings.
Troubleshooting
Fault codes
(cont.)
5792 925 GB
Diagnosis
Summary of Contents for Vitocrossal 100 CI1
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