Viessmann Vitodens 333 Service Instructions Manual page 78

Troubleshooting
Checking and acknowledging faults
Display Const.
fault code
bC
bd
bE
bF
C2 X
C5 X
C6
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
X Control
mode,
max. pump
speed
(cont.)
Cause Remedy
Communication Check con-
fault – Vitotrol re-
nections,
mote control heat- cable, coding
ing circuit A1 address A0
and remote
control DIP
switches
Communication
fault – Vitotrol re-
mote control heat-
ing circuit M2
Vitotrol remote Check DIP
control incorrectly switch set-
encoded tings of re-
mote control
Incorrect LON com- Replace LON
munication module communica-
tion module
Communication Check con-
fault – solar control
nections and
unit coding ad-
dress 54
Communication Check coding
fault – variable
address 30
speed internal settings;
pump check heating
circuit pump
DIP switch
settings
Communication Check coding
fault – variable
address E5
speed heating cir- settings;
cuit pump, heating check heating
circuit M2 circuit pump
DIP switch
settings