Viessmann Vitodens 200-W Installation Instructions Manual page 126

Troubleshooting
Fault codes
(cont.)
Dis- Const.
played
fault
code
dC
dd
dE
dF
E0
126
Weath.- System char-
comp. acteristics
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
Cause Measures
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,
ature sensor, heating circuit 1
heating circuit and remote control
1 (without settings (see
mixer) page 160)
Lead break, Check room tem-
room temper- perature sensor,
ature sensor, heating circuit 2
heating circuit and remote control
2 (with mixer) settings (see
page 160)
Lead break, Check room tem-
room temper- perature sensor,
ature sensor, heating circuit 3
heating circuit and remote control
3 (with mixer) settings (see
page 160)
Fault, exter- Check connections
nal LON sub- and LON subscrib-
scriber ers