Viessmann VITOLIGNO 300-P Service Instructions Manual page 92

Troubleshooting
Fault display
Displayed System characteris-
fault code tics
BD Control mode without
remote control
BF Control mode
C2 Control mode
C4 Control mode
CD Control mode
CF Control mode
D4 Burner stop initiation,
pellet supply stopped
DA Control mode without
room influence
92
(cont.)
Cause
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
Vitocom 100 com-
munication error
LON communica-
tion module fault
High limit safety
cut-out has
responded (boiler
water temperature
above 100 °C)
Short circuit, room
temperature sen-
sor, heating cir-
cuit 1
Measures
Check connections,
cable, coding address
"A0" and remote control
DIP switch (see
pages 107 and 108)
Replace LON communi-
cation module (see
page 112)
Check KM BUS cable and
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; replace
Vitocom 100 if required
Without Vitocom 100:
Set code "95:0"
Replace LON communi-
cation module (see
page 112).
Without module:
Set code "76:0"
Wait until the boiler water
temperature has fallen
below the safety tempera-
ture and reset the high
limit safety cut-out
Check the room tempera-
ture sensor (see
page 110)