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Troubleshooting
Fault codes
(cont.)
Display fault
System char-
code
acteristics
9F
Control mode
A7
Control mode
as per the de-
livered condi-
tion
b0
Burner
blocked
b8
b1
Control mode
as per the de-
livered condi-
tion
b4
Regulates as if
the outside
temperature
was 0 °C
b5
Control mode
as per the de-
livered condi-
tion
b7
Burner
blocked
bA
Mixer M2 regu-
lates in accor-
dance with the
last trans-
mitted set
value
bC
Control mode
without remote
control
70
Cause
Solar control unit fault
message
Faulty programming unit
Flue gas temperature
sensor shorted out
Flue gas temperature
sensor break
Communication error pro-
gramming unit (internal)
Internal fault analog con-
verter
Internal fault
Boiler coding card miss-
ing, faulty or incorrect
boiler coding card
Communication fault
extension kit for heating
circuit with mixer M2
Communication fault
Vitotrol remote control,
heating circuit A1
Measures
See solar control
unit service in-
structions
Replace program-
ming unit
Check the flue
gas temperature
sensor (see
page 79)
Check connec-
tions and replace
programming unit,
if required
Replace the con-
trol unit
Replace the con-
trol unit
Plug in boiler cod-
ing card or re-
place, if faulty
Check the exten-
sion kit connec-
tions and coding.
Start the exten-
sion kit.
Check connec-
tions, cable, cod-
ing address "A0"
and the remote
control DIP
switches
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