Viessmann D2RA, Installation Instructions For Contractors

Page: 97 / 164

97
Fault code dis-
played System characteristics Cause Measures
bE Control mode without remote
control Communication error,
Vitotrol remote control,
heating circuit 3 (with mix-
er) Check connections, cable, coding
address "A0" in the
"Heating cir-
cuit" group and remote control set-
tings (see page 148).
With wireless remote controls:
check connection; place remote
control close to the heat source.
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 extension Check connections.
C4 Control mode Communication error,
OpenTherm extension Check OpenTherm extension.
C5 Control mode, max. pump
speed Communication error, vari-
able speed secondary
pump Check setting of coding address
"30" in the
"Boiler" group.
Cd Control mode Communication error,
Vitocom 100 (KM-BUS) Check connections, Vitocom 100,
type GSM2 and coding address
"95" in the
"General" group.
CF Control mode Communication error,
LON communication mod-
ule Check whether the LON communi-
cation module is correctly inserted.
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.
External room temperature sensor
for Vitotrol 300-A or integrated sen-
sor for Vitotrol 200-A/200-RF/
300-A/300-RF
db Control mode without room
influence Short circuit, room tem-
perature sensor, heating
circuit 2 (with mixer) Check room temperature sensor,
heating circuit 2.
External room temperature sensor
for Vitotrol 300-A or integrated sen-
sor for Vitotrol 200-A/200-RF/300-
A/300-RF
dC Control mode without room
influence Short circuit, room tem-
perature sensor, heating
circuit 3 (with mixer) Check room temperature sensor,
heating circuit 3.
External room temperature sensor
for Vitotrol 300-A or integrated sen-
sor for Vitotrol 200-A/200-RF/300-
A/300-RF
Troubleshooting
Fault codes
(cont.)
5678 044 GB
Diagnosis