Viessmann Vitoligno 300-P Service Instructions For Contractors page 82

Troubleshooting
Fault display
Fault code System characteris-
on the dis- tics
play
BB Mixer M2 continues
to regulate
BC Control mode without
remote control
BD Control mode without
remote control
BF Control mode
C2 Control mode
C4 Control mode
CD Control mode
CF Control mode
82
(cont.)
Cause
Communication
error, extension kit
for heating circuit
with mixer M2
Communication
error, Vitotrol
remote control,
heating circuit 1
Communication
error, Vitotrol
remote control,
heating circuit 2
Incorrect LON
communication
module
Lead break, KM
BUS to solar con-
trol unit
Communication
error, function
extension 0 to
10 V
Vitocom100 com-
munication error
LON communica-
tion module fault
Measures
Check extension kit con-
nections and code. Start
the extension kit
Check connections,
cable, coding address
"A0" and remote control
DIP switches (see
page 94 and 96)
Check connections,
cable, coding address
"A0" and remote control
DIP switches (see
page 94 and 96)
Replace LON communi-
cation module (see
page 101)
Check KM BUS cable and
the solar control unit.
Without solar control unit:
Set code "54:0"
Check connections and
cables/leads. If required,
replace the function
extension.
Without function exten-
sion:
Set code "9D:0"
Check connections and
cables/leads; possibly
replace Vitocom 100.
Without Vitocom 100:
Set code "95:0"
Replace LON communi-
cation module (see
page 101).
Without module:
Set code "76:0"