Fault code
on the dis-
play
System character-
istics
Cause
Measures
20
Regulates without
flow temperature
sensor (low loss
header)
System flow tem-
perature sensor
shorted out
Check the low loss
header sensor (see
page 75).
28
Regulates without
flow temperature
sensor (low loss
header)
System flow tem-
perature sensor
lead broken
Check the low loss
header sensor (see
page 75).
30
Burner blocked
Boiler water tem-
perature sensor
shorted out
Check the boiler water
temperature sensor (see
page 75).
38
Burner blocked
Boiler water tem-
perature sensor
lead broken
Check the boiler water
temperature sensor (see
page 75).
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 the sensor (see
page 75).
58
No DHW heating
Cylinder tempera-
ture sensor lead
broken
Check the sensor (see
page 75).
A7
Control mode as per
delivered condition
Faulty program-
ming unit
Replace the program-
ming unit.
b0
Burner blocked
Flue gas tem-
perature sensor
shorted out
Check the flue gas tem-
perature sensor (see
page 77).
b1
Control mode as per
delivered condition
Communication
fault; program-
ming unit (inter-
nal)
Check connections and
replace the program-
ming unit if required.
Fault codes
(cont.)
69
Troubleshooting
5692
779
GB
Содержание VITOLADENS333-F
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