Fault code
in the dis-
play
Const.
Weat-
h.
comp.
System
character-
istics
Cause
Remedy
C6
X
Control
mode,
max. pump
speed
Communication
fault - variable
speed heating cir-
cuit pump, heating
circuit M2
Check coding
address E5
settings;
check the
heating cir-
cuit pump
DIP switch
settings
C7
X
X
Control
mode,
max. pump
speed
Communication
fault - variable
speed heating cir-
cuit pump, heating
circuit A1
Check coding
address E5
settings;
check the
heating cir-
cuit pump
DIP switch
settings
Cd
X
X
Control
mode
Communication
fault Vitocom 100
(KM BUS)
Check the
Vitocom 100
and connec-
tions
CE
X
X
Control
mode
Communication
error - ext. exten-
sion
Check con-
nections and
coding
address 2E
settings.
CF
X
Control
mode
Communications
fault - LON commu-
nication module
Replace the
LON commu-
nication mod-
ule
dA
X
Control
mode with-
out room
influence
Room temperature
sensor heating cir-
cuit A1 shorted out
Check the
room tem-
perature sen-
sor - heating
circuit A1
db
X
Heating circuit M2
room temperature
sensor shorted out
Check the
room tem-
perature sen-
sor - heating
circuit M2
Checking and acknowledging faults
(cont.)
79
Troubleshooting
56
92
548
GB
Summary of Contents for VITODENS 333
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