1.
G
+
d
press simultaneously for
approx. 2 s.
2.
a
/
b
press for individual fault
codes.
3.
Note
All saved fault codes can be
deleted with
e
.
4.
d
terminate the scan.
Fault codes
Display
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Remedy
0F
X
X
Control mode
Maintenance Carry out mainte-
nance. After the
maintenance, set
code "24:0".
10
X
X
Regulates as
if the outside
temperature
was 0 °C
Outside tem-
perature
sensor
shorted out
Check the outside
temperature sen-
sor (see page 83).
18
X
X
Regulates as
if the outside
temperature
was 0 °C
Outside tem-
perature
sensor lead
broken
Check the outside
temperature sen-
sor (see page 83).
20
X
X
Regulates
without flow
temperature
sensor (low
loss header)
System flow
temperature
sensor
shorted out
Check the low
loss header sen-
sor (see page 85)
28
X
X
Regulates
without flow
temperature
sensor (low
loss header)
System flow
temperature
sensor lead
broken
Check the low
loss header sen-
sor (see page 85)
30
X
X
Burner
blocked
Boiler water
temperature
sensor
shorted out
Check the boiler
water tempera-
ture sensor (see
page 85).
Calling up fault codes from the fault memory (fault . . .
(cont.)
74
Troubleshooting
5692
569
GB
Summary of Contents for Vitodens 300
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