Viessmann Vitodens 333-F Service Instructions Manual page 81

Fault codes
(cont.)
Fault Const. weath.-
code comp.
on the
display
bC X
bd X
bE X
bF X
C5 X X
C6 X
System char- Cause
acteristics
Control mode Communica-
tion fault –
without remote
control Vitotrol re-
mote control,
heating cir-
cuit A1
Control mode Communica-
without remote tion fault,
control Vitotrol re-
mote control,
heating cir-
cuit M2
Control mode Vitotrol re-
mote control
incorrectly
programmed
Control mode Incorrect
LON com-
munication
module
Control mode, Communica-
max. pump tion fault,
speed variable
speed inter-
nal pump
Control mode, Communica-
tion fault –
max. pump
speed external vari-
able speed
heating cir-
cuit pump,
heating
circuit M2
Troubleshooting
Measures
Check connec-
tions, cable, cod-
ing address "A0"
and remote con-
trol DIP switches
(see page 114).
Check connec-
tions, cable, cod-
ing address "A0"
and remote con-
trol DIP switches
(see page 114).
Check remote
control DIP switch
setting (see
page 114)
Replace the LON
communication
module
Check the setting
of coding address
"30"
Check setting of
coding address
"E5"
81