Fault
code
on the
display
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
28
X
Regulates
without flow
temperature
sensor (low
loss header)
System flow
temperature
sensor lead
broken
Check the low
loss header sen-
sor (see page 82).
30
X
X
Burner
blocked
Boiler water
temperature
sensor
shorted out
Check the boiler
water tempera-
ture sensor (see
page 82).
38
X
X
Burner
blocked
Boiler water
temperature
sensor lead
broken
Check the boiler
water tempera-
ture sensor (see
page 82).
40
X
Mixer closes
Heating cir-
cuit with
mixer M2
flow tem-
perature
sensor
shorted out
Check the flow
temperature sen-
sor.
48
X
Mixer closes
Heating cir-
cuit M2 flow
temperature
sensor lead
broken
Check the flow
temperature sen-
sor.
50
X
X
No DHW heat-
ing
Cylinder
temperature
sensor
shorted out
Check the sensor
(see page 82).
58
X
X
No DHW heat-
ing
Cylinder
temperature
sensor lead
broken
Check the sensor
(see page 82).
Fault codes
(cont.)
71
Troubleshooting
5692
761
GB
Summary of Contents for Vitodens 200-W WB2B Series
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