Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors page 68

Troubleshooting
Fault codes
(cont.)
Fault code dis- System characteristics
played
9F Control mode
A3 Burner blocked.
A7 Control mode with incorrect
time
b0 Burner blocked
b1 Control mode as per deliv-
ered condition
b5 Control mode as per deliv-
ered condition
b7 Burner blocked
b8 Burner blocked
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
C3 Control mode
68
Cause
Solar control module or
Vitosolic fault
Flue gas temperature sen-
sor incorrectly positioned.
Programming unit faulty
Short circuit, flue gas tem-
perature sensor
Communication error, pro-
gramming unit
Internal fault
Boiler coding card fault
Lead break, flue gas tem-
perature sensor
Communication error, ex-
tension kit for heating cir-
cuit 2 (with mixer)
Communication error, ex-
tension kit for heating cir-
cuit 3 (with mixer)
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)
Incorrect LON communi-
cation module
Communication error, EA1
extension
Communication error, so-
lar control module or
Vitosolic
Communication error,
AM1 extension
Measures
Replace solar control module or
Vitosolic.
Fit flue gas temperature sensor
correctly (see page 75).
Replace the programming unit.
Check flue gas temperature sen-
sor.
Check connections; replace pro-
gramming unit if necessary.
Replace control unit.
Plug in boiler coding card or re-
place if faulty.
Check flue gas temperature sen-
sor.
Check extension kit connections
and code.
Check extension kit connections
and code.
Check connections, cable, coding
address "A0" in the "Heating cir-
cuit" group and remote control set-
tings (see page 102).
For wireless remote control units:
check connection; place remote
control close to the boiler.
Check connections, cable, coding
address "A0" in the "Heating cir-
cuit" group and remote control set-
tings (see page 102).
For wireless remote control units:
check connection; place remote
control close to the boiler.
Check connections, cable, coding
address "A0" in the "Heating cir-
cuit" group and remote control set-
tings (see page 102).
For wireless remote control units:
check connection; place remote
control close to the boiler.
Replace LON communication mod-
ule.
Check connections.
Check solar control module or
Vitosolic.
Check connections.