Viessmann Vitoladens 300-C Installation And Service Instructions Manual page 82

Troubleshooting
Fault codes
(cont.)
Displayed fault System characteristics
code
b0 Burner locked out
b1 Control mode as per deliv-
ered condition
b5 Control mode as per deliv-
ered condition
b7 Burner locked out
b8 Burner locked out
bA Mixer regulates to 20 °C flow
temperature.
bb Mixer regulates to 20 °C flow
temperature.
bC Control mode without remote
control
bd Control mode without remote
control
bE Control mode without remote
control
bF Control mode
C1 Control mode
C2 Control mode
Cd Control mode
CF Control mode
d6 Control mode
d7 Control mode
82
Cause
Short circuit, flue gas tem-
perature sensor
Communication error, pro-
gramming unit
Internal error
Boiler coding card fault
Lead break, flue gas tem-
perature sensor
Communication error, mix-
er M2 extension kit
Communication error, mix-
er M3 extension kit
Communication error,
Vitotrol remote control,
heating circuit 1 (without
mixer)
Communication error,
Vitotrol remote control,
heating circuit 2 (with mix-
er)
Communication error,
Vitotrol remote control,
heating circuit 3 (with mix-
er)
Wrong LON communica-
tion module
EA1 extension communi-
cation error
Communication error, so-
lar control module or
Vitosolic
Communication error,
Vitocom 100 (KM-BUS)
Communication error,
LON communication mod-
ule
Input DE1 at
EA1 extension reports a
fault.
Input DE2 at
EA1 extension reports a
fault.
Measures
Check flue gas temperature sen-
sor.
Check connections and replace
programming unit if necessary.
Replace control unit.
Plug in boiler coding card or re-
place if faulty.
Check flue gas temperature sen-
sor.
Check mixer extension kit connec-
tions and code.
Check mixer extension kit connec-
tions and code.
Check connections, lead, coding
address "A0" and remote control
settings (see page 97). For wire-
less remote control units: Check
connection; place remote control
close to the boiler.
Check connections, lead, coding
address "A0" and remote control
settings (see page 97). For wire-
less remote control units: Check
connection; place remote control
close to the boiler.
Check connections, lead, coding
address "A0" and remote control
settings (see page 97). For wire-
less remote control units: Check
connection; place remote control
close to the boiler.
Replace LON communication mod-
ule.
Check the connections.
Check solar control module or
Vitosolic.
Check connections, Vitocom 100
and coding address "95".
Replace LON communication mod-
ule.
Remedy fault at affected appliance.
Remedy fault at affected appliance.