Fault code
on the dis-
play
System character-
istics
Cause
Measures
10
Regulates as if the
outside temperature
was 0 °C
Outside tempera-
ture sensor
shorted out
Check the outside tem-
perature sensor (see
page 99).
18
Regulates as if the
outside temperature
was 0 °C
Outside tempera-
ture sensor lead
broken
Check the outside tem-
perature sensor (see
page 99).
20
Regulates without
flow temperature
sensor (low loss
header)
System flow tem-
perature sensor
shorted out
Check the low loss
header sensor (see
page 101).
28
Regulates without
flow temperature
sensor (low loss
header)
System flow tem-
perature sensor
lead broken
Check the low loss
header sensor (see
page 101).
30
Burner blocked
Boiler water tem-
perature sensor
shorted out
Check the boiler water
temperature sensor (see
page 101).
38
Burner blocked
Boiler water tem-
perature sensor
lead broken
Check the boiler water
temperature sensor (see
page 101).
40
Mixer closes.
Heating circuit
with mixer M2
flow temperature
sensor shorted
out
Check the flow tempera-
ture sensor.
48
Mixer closes.
Heating circuit M2
flow temperature
sensor lead bro-
ken
Check the flow tempera-
ture sensor.
50
No DHW heating
Cylinder tempera-
ture sensor
shorted out
Check sensors (see
page 101).
58
No DHW heating
Cylinder tempera-
ture sensor lead
broken
Check sensors (see
page 101).
92
Control mode
Solar: Collector
temperature sen-
sor S1 at the
Vitosolic shorted
out
Check the sensor (see
page 102).
Fault codes
(cont.)
93
Troubleshooting
5592
883
GB
Service
Summary of Contents for VITODENS 343-F WS4A
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