Fault
code
on the
display
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
9C
X
X
Control mode
Temperature
sensor lead
broken; con-
nects to the
Vitosolic at
S2
Check the sensor
at the Vitosolic.
9F
X
X
Control mode
Solar control
unit fault;
displayed if a
fault without
fault code
occurs at the
solar control
unit
Check the solar
control unit (see
solar control unit
service instruc-
tions).
A7
X
Control mode
as per the de-
livered condi-
tion
Faulty pro-
gramming
unit
Replace program-
ming unit
b0
X
X
Burner
blocked
Flue gas
temperature
sensor
shorted out
Check the flue
gas temperature
sensor
b1
X
X
Control mode
as per the de-
livered condi-
tion
Communica-
tion error,
program-
ming unit
Check connec-
tions and replace
the programming
unit, if required
b4
X
X
Regulates as
if the outside
temperature
was 0 °C
Internal fault
Replace the con-
trol unit
b5
X
X
Control mode
as per the de-
livered condi-
tion
Internal fault
Replace the con-
trol unit
b7
X
X
Burner
blocked
Boiler coding
card fault
Plug in boiler cod-
ing card or re-
place, if faulty
Fault codes
(cont.)
76
Troubleshooting
5692
731
GB
Summary of Contents for VITODENS 333-F WS3A
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