Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 126

Troubleshooting
Fault codes
(cont.)
Dis- Const.
played
fault
code
bC
bd
126
Weath.- System char-
comp. acteristics
X Control mode
without remote
control
X Control mode
without remote
control
Cause Measures
Communica- Check connec-
tion error, re- tions, cable, coding
mote control address "A0" in
Vitotrol heat- group "Heating
ing circuit 1 circuit..."5/ and re-
(without mix- mote control con-
er) figuration (see
page 166).
For wireless re-
mote controls:
Check connec-
tions, place remote
control unit close to
the boiler
Communica- Check connec-
tion error, re- tions, cable, coding
mote control address "A0" in
Vitotrol heat- group "Heating
ing circuit 2 circuit..."/5 and re-
(with mixer) mote control con-
figuration (see
page 166).
For wireless re-
mote controls:
Check connec-
tions, place remote
control unit close to
the boiler