Viessmann VITOCROSSAL Service Instructions Manual page 70

Troubleshooting
Fault codes
(cont.)
Fault code dis- System characteristics
played
B1 Control mode as per deliv-
ered condition
B5 Control mode as per deliv-
ered condition
B7 Burner blocked
B8 Burner blocked
BA Mixer regulates to 20 °C flow
temperature.
BB Mixer regulates to 20 °C flow
temperature.
BC Control mode without remote
control
BD Control mode without remote
control
BE Control mode without remote
control
BF Control mode
C1 Control mode
C2 Control mode
C3 Control mode
CF Control mode
D6 Control mode
D7 Control mode
D8 Control mode
70
Cause
Communication error, pro-
gramming unit
Internal fault
Fault, coding card
Lead break, flue gas tem-
perature sensor
Communication error, ex-
tension kit for heating cir-
cuit 2 (with mixer)
Communication error, ex-
tension kit for heating cir-
cuit 3 (with mixer)
Communication error, Vi-
totrol remote control, heat-
ing circuit 1 (without mix-
er)
Communication error, Vi-
totrol remote control, heat-
ing circuit 2 (with mixer)
Communication error, Vi-
totrol remote control, heat-
ing circuit 3 (with mixer)
Incorrect LON communi-
cation module
Communication error, EA1
extension
Communication error, so-
lar control module or Vito-
solic
Communication error,
AM1
Communication error,
LON communication mod-
ule
Input DE1 at EA1 exten-
sion reports a fault.
Input DE2 at EA1 exten-
sion reports a fault.
Input DE3 at EA1 exten-
sion reports a fault.
Measures
Check connections; replace pro-
gramming unit if necessary.
Replace control unit.
Plug in coding card or replace if
faulty.
Check flue gas temperature sen-
sor.
Check extension kit connections
and code.
Check extension kit connections
and code.
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.
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.
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.
Replace LON communication mod-
ule.
Check connections.
Check solar control module or Vito-
solic.
Check connections.
Replace LON communication mod-
ule.
Remedy fault at appliance con-
cerned.
Remedy fault at appliance con-
cerned.
Remedy fault at appliance con-
cerned.