Viessmann VITODENs 200 Installation Instructions Manual page 94

Troubleshooting
Checking and acknowledging faults
Fault code Const.
in the dis-
play
bC
bd
bE
bF
C2 X
C5 X
78
Weat- System
h. character-
comp. istics
X Control
mode with-
out remote
control
X Control
mode with-
out remote
control
X Control
mode
X Control
mode
X Control
mode
X Control
mode,
max. pump
speed
(cont.)
Cause
Communication
fault - Vitotrol
remote control
heating circuit A1
Communication
fault - Vitotrol
remote control
heating circuit M2
Vitotrol remote
control incorrectly
encoded
Incorrect LON com-
munication module
Communication
fault - solar control
unit
Communication
fault - variable
speed internal
pump
Remedy
Check con-
nections,
cable, coding
address A0
and the
remote con-
trol DIP
switches
Check the
DIP switch
settings of
the remote
control
Replace the
LON commu-
nication mod-
ule
Check con-
nections and
coding
address 54
Check coding
address 30
settings;
check the
heating cir-
cuit pump
DIP switch
settings.