Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 129

Fault codes
(cont.)
Dis- Const.
played
fault
code
db
dC
dd
dE
dF
E0
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
without room
influence
X Control mode
Troubleshooting
Cause Measures
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 configuration (see
mixer) page 166)
Lead break, Check room tem-
room temper- perature sensor for
ature sensor, heating circuit 2
heating circuit and remote control
2 (with mixer) configuration (see
page 166)
Lead break, Check room tem-
room temper- perature sensor for
ature sensor, heating circuit 3
heating circuit and remote control
3 (with mixer) configuration (see
page 166)
Fault, exter- Check connections
nal LON sub- and LON subscrib-
scriber ers
129