Viessmann Vitodens 200-W Installation And Service Instructions Manual page 127

Fault codes
(cont.)
Dis- Const.
played
fault
code
d8 X
dA
db
dC
dd
dE
dF
Weath.- System char-
comp. acteristics
X Control mode
X Control mode
without room
influence
X Control mode
without room
influence
X Control mode
without room
influence
X Control mode
without room
influence
X Control mode
without room
influence
X Control mode
without room
influence
Troubleshooting
Cause Measures
Input DE3 re- Remove fault at
ports a fault at appliance con-
extension cerned.
EA1
Short circuit, Check room tem-
room temper- perature sensor,
ature sensor, heating circuit 1.
heating circuit
1 (without
mixer)
Short circuit, Check room tem-
room temper- perature sensor,
ature sensor, heating circuit 2.
heating circuit
2 (with mixer)
Short circuit, Check room tem-
room temper- perature sensor,
ature sensor, heating circuit 3.
heating circuit
3 (with mixer)
Lead break, Check room tem-
room temper- perature sensor for
ature sensor, heating circuit 1
heating circuit and remote control
1 (without settings.
mixer)
Lead break, Check room tem-
room temper- perature sensor for
ature sensor, heating circuit 2
heating circuit and remote control
2 (with mixer) settings.
Lead break, Check room tem-
room temper- perature sensor for
ature sensor, heating circuit 3
heating circuit and remote control
3 (with mixer) settings.
127