Operating instructions

The10mostrecentfaultsaresaved
and may be scanned.
The faults are ordere d according to
date, thus the most recent fault is fault
number 1.
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 Terminate the scan.
Fault codes
Fault
code in
the dis-
play
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 Controls as if
the outside
temperature
was 0 °C
Outside tem-
perature
sensor
shorted out
Check the outsid e
temperature sen-
sor (see page 79)
18 X X Controls as if
the outside
temperature
was 0 °C
Outside tem-
perature
sensor lead
broken
Check the outsid e
temperature sen-
sor (see page 79)
20 X X Regulated
without flow
temperature
sensor (low
loss header)
System flow
temperature
sensor
shorted out
Check the low
loss header sen-
sor (see page 80)
28 X X Regulated
without flow
temperature
sensor (low
loss header)
System flow
temperature
sensor lead
broken
Check the low
loss header sen-
sor (see page 80)
Calling up fault codes from the fault memory (fault history)
71
Troubleshooting
5692 619 GB