Display
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Remedy
38
X
X
Burner
blocked
Boiler water
temperature
sensor lead
broken
Check the boiler
water tempera-
ture sensor (see
page 85).
40
X
Mixer closes.
Mixer circuit
M2 flow tem-
perature
sensor
shorted out
Check the flow
temperature sen-
sor.
48
X
Mixer closes.
Mixer circuit
M2 flow tem-
perature
sensor lead
broken
Check the flow
temperature sen-
sor.
50
X
X
No DHW heat-
ing
Cylinder
temperature
sensor/com-
fort sensor/
primary sen-
sor shorted
out
Check sensors
(see page 85).
58
X
X
No DHW heat-
ing
Cylinder
temperature
sensor/com-
fort sensor/
primary sen-
sor lead bro-
ken
Check sensors
(see page 85).
51
X
X
No DHW heat-
ing
Cylinder
temperature
sensor 2
lead broken
Check sensors
(see page 85).
59
X
X
No DHW heat-
ing
Cylinder
temperature
sensor 2
lead broken
Check sensors
(see page 85).
Fault codes
(cont.)
75
Troubleshooting
5692
569
GB
Содержание Vitodens 300
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