Viessmann VITODENS 333 Service Instructions Manual page 79

Checking and acknowledging faults
Fault code Const.
in the dis-
play
C6
C7 X
Cd X
CE X
CF
dA
db
Weat- System
h. character-
comp. istics
X Control
mode,
max. pump
speed
X Control
mode,
max. pump
speed
X Control
mode
X Control
mode
X Control
mode
X Control
mode with-
out room
influence
X
Troubleshooting
(cont.)
Cause Remedy
Communication Check coding
fault - variable address E5
speed heating cir- settings;
cuit pump, heating check the
circuit M2 heating cir-
cuit pump
DIP switch
settings
Communication Check coding
fault - variable address E5
speed heating cir- settings;
cuit pump, heating check the
circuit A1 heating cir-
cuit pump
DIP switch
settings
Communication Check the
fault Vitocom 100 Vitocom 100
(KM BUS) and connec-
tions
Communication Check con-
error - ext. exten- nections and
sion coding
address 2E
settings.
Communications Replace the
fault - LON commu- LON commu-
nication module nication mod-
ule
Room temperature Check the
sensor heating cir- room tem-
cuit A1 shorted out perature sen-
sor - heating
circuit A1
Heating circuit M2 Check the
room temperature room tem-
sensor shorted out perature sen-
sor - heating
circuit M2
79