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Fault codes
(cont.)
Display fault
System char-
code
acteristics
10
Regulates as if
the outside
temperature
was 0 °C
18
20
Regulates
without flow
temperature
sensor (low
loss header)
28
30
Burner
blocked
38
40
Mixer closes
48
50
No DHW heat-
ing
58
92
Control mode
9A
93
Control mode
9B
94
Control mode
9C
Cause
Outside temperature sen-
sor shorted out
Outside temperature sen-
sor lead broken
System flow temperature
sensor shorted out
System flow temperature
sensor lead broken
Boiler water temperature
sensor shorted out
Boiler water temperature
sensor lead broken
Heating circuit with mixer
M2 flow temperature sen-
sor shorted out
Heating circuit with mixer
M2 flow temperature sen-
sor lead broken
Cylinder temperature
sensor shorted out
Cylinder temperature
sensor lead broken
Solar: Collector tempera-
ture sensor shorted out
Collector temperature
sensor lead broken
Solar: Sensor S3 shorted
out
Sensor S3 lead broken
Solar: Cylinder tempera-
ture sensor shorted out
Cylinder temperature
sensor lead broken
Troubleshooting
Measures
Check the outside
temperature sen-
sor (see page 75)
Check the low
loss header sen-
sor (see page 77)
Check the boiler
water temperature
sensor (see
page 77)
Check flow tem-
perature sensor
Check sensors
(see page 77)
Check sensor
Check sensor
Check sensor
69
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