Viessmann Vitodens 333 Service Instructions Manual page 75

Fault codes
(cont.)
Display Const. Weath.
fault comp.
code
bE X
bF X
C5 X X
C6 X
C7 X X
Cd X X
CE X X
System char- Cause
acteristics
Control mode Vitotrol re-
mote control
incorrectly
encoded
Control mode Incorrect
LON com-
munication
module
Control mode, Communica-
max. pump tion error
speed variable
speed inter-
nal pump
Control mode, Communica-
max. pump tion fault
speed external vari-
able speed
heating cir-
cuit pump,
heating
circuit M2
Control mode, Communica-
max. pump tion fault
speed external vari-
able speed
circulation
pump, heat-
ing circuit A1
Control mode Communica-
tion fault
Vitocom 100
(KM BUS)
Control mode Communica-
tion fault
ext. exten-
sion
Troubleshooting
Remedy
Check remote
control DIP switch
settings (see
page 105)
Replace the LON
communication
module
Check coding ad-
dress "30" set-
tings; check the
DIP switch set-
tings in the pump
wiring box:
Switch 1: OFF,
Switch 2: ON
Check coding ad-
dress "E5" set-
tings; check the
DIP switch set-
tings in the pump
wiring box:
Switch 1: OFF,
Switch 2: ON
Check coding ad-
dress "E5" set-
tings; check the
DIP switch set-
tings in the pump
wiring box:
Switch 1: ON,
Switch 2: OFF
Check connec-
tions, Vitocom 100
and coding ad-
dress "95"
Check connec-
tions and coding
address "2E"
75