Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 128

Troubleshooting
Fault codes
(cont.)
Dis- Const.
played
fault
code
Cd
CF
d6 X
d7 X
d8 X
dA
128
Weath.- System char-
comp. acteristics
Control mode
X Control mode.
No communi-
cation via LON
X Control mode
X Control mode
X Control mode
X Control mode
without room
influence
Cause Measures
Communica- Check connections
tion error, and Vitocom 100
Vitocom 100 (see separate in-
stallation and serv-
ice instructions).
Without Vitocom
100: Set code
"95:0" in group
"General"/1
Communica- Check LON com-
tion error, munication module
LON commu- and replace if re-
nication mod- quired.
ule If no LON commu-
nication module is
installed, set code
"76:0" in group
"General"/1
Input DE1 re- Remove fault at
ports a fault at appliance con-
extension cerned
EA1
Input DE2 at Remove fault at
extension appliance con-
EA1 reports a cerned
fault
Input DE3 at Remove fault at
extension appliance con-
EA1 reports a cerned
fault
Short circuit, Check room tem-
room temper- perature sensor,
ature sensor, heating circuit 1
heating circuit
1 (without
mixer)