Viessmann VITODENS 200-W Service Instructions Manual page 103

Fault codes
(cont.)
Dis- Const. Weath.-
played comp.
fault
code
d6 X X
d7 X X
d8 X X
dA X
db X
dC X
dd X
dE X
System char- Cause
acteristics
Control mode Input DE1
fault at exten-
sion EA1
Control mode Input DE2
fault at exten-
sion EA1
Control mode Input DE3
fault at exten-
sion EA1
Control mode Short circuit,
without room room temper-
influence ature sensor,
heating circuit
1 (without
mixer)
Control mode Short circuit,
without room room temper-
influence ature sensor,
heating circuit
2 (with mixer)
Control mode Short circuit,
without room room temper-
influence ature sensor,
heating circuit
3 (with mixer)
Control mode Lead break,
without room room temper-
influence ature sensor,
heating circuit
1 (without
mixer)
Control mode Lead break,
without room room temper-
influence ature sensor,
heating circuit
2 (with mixer)
Troubleshooting
Measures
Check connection
to input DE1
Check connection
to input DE2
Check connection
to input DE3
Check room tem-
perature sensor,
heating circuit 1
Check room tem-
perature sensor,
heating circuit 2
Check room tem-
perature sensor,
heating circuit 3
Check room tem-
perature sensor for
heating circuit 1
and remote control
settings (see
page 132)
Check room tem-
perature sensor for
heating circuit 2
and remote control
settings (see
page 132)
103