Operating instructions

Calling up fault codes from the fault memory (fault history)
The 10 most recent faults are saved
and may be scanned.
The faults are ordered by date, thus
the most recent fault is fault number 1.
Press the following keys:
1. G + d simultaneously for
approx. 2 s.
2. a/b for individual fault
codes.
3. Note
All saved fault codes can be
deleted with e.
4. d Scanning is completed.
Fault codes
Fault
code
on the
display
Const. weath.-
comp.
System char-
acteristics
Cause Measures
0F X X Control mode Service Service the equip-
ment. After the
service, set cod-
ing address
"24:0".
10 X Regulates as
if the outside
temperature
was 0 °C
Outside tem-
perature
sensor
shorted out
Check the outside
temperature sen-
sor (see page 79).
18 X Regulates as
if the outside
temperature
was 0 °C
Outside tem-
perature
sensor lead
broken
Check the outside
temperature sen-
sor (see page 79).
20 X Regulates
without flow
temperature
sensor (low
loss header)
System flow
temperature
sensor
shorted out
Check the low
loss header sen-
sor (see page 80).
Fault display (cont.)
69
Troubleshooting
5692 672 GB