Viessmann Vitodens 300 Service Instructions Manual page 80

Troubleshooting
Checking and acknowledging faults
Displayed Const.
fault code
C6
C7 X
Cd X
CE X
CF
dA
db
80
Weat- System
her- 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
(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 con-
fault Vitocom 100 nections and
(KM BUS) Vitocom 100
Communication Check con-
fault - 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