Viessmann Vitocrossal 100 CI1, Service Instructions For Contractors

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67
Fault code dis-
played System characteristics Cause Measures
B0 Burner blocked Short circuit, flue gas tem-
perature sensor Check flue gas temperature sen-
sor.
B1 Control mode as per deliv-
ered condition Communication error, pro-
gramming unit Check connections; replace pro-
gramming unit if necessary.
B5 Control mode as per deliv-
ered condition Internal fault Replace control unit.
B7 Burner blocked Fault, coding card Plug in coding card or replace if
faulty.
B8 Burner blocked Lead break, flue gas tem-
perature sensor Check flue gas temperature sen-
sor.
BA Mixer regulates to 20 °C flow
temperature. Communication error, ex-
tension kit for heating cir-
cuit 2 (with mixer) Check extension kit connections
and code.
BB Mixer regulates to 20 °C flow
temperature. Communication error, ex-
tension kit for heating cir-
cuit 3 (with mixer) Check extension kit connections
and code.
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.
Troubleshooting
Fault codes
(cont.)
5792 925 GB
Diagnosis