Operating instructions

112
Dis-
played
fault
code
Const. Weath.-
comp.
System char-
acteristics
Cause Measures
10 X X Controls as if
the outside
temperature
were 0 °C
Short circuit,
outside tem-
perature sen-
sor
Check outside tem-
perature sensor
(see page 129)
18 X X Controls as if
the outside
temperature
were 0 °C
Lead break,
outside tem-
perature sen-
sor
Check outside tem-
perature sensor
(see page 129)
19 X X Controls as if
the outside
temperature
were 0 °C
Communica-
tion interrup-
tion with wire-
less outside
temperature
sensor
Check wireless
connection (place
wireless outside
temperature sen-
sor close to the
wireless base sta-
tion).
Log off outside
temperature sen-
sor then log on
again.
Wireless
base sta-
tion installa-
tion and
service in-
structions
Replace wireless
outside tempera-
ture sensor.
20 X X Regulates with-
out flow tem-
perature sen-
sor (low loss
header)
Short circuit,
flow tempera-
ture sensor
Check low loss
header sensor (see
page 130)
Troubleshooting
Fault codes
5772 909 GB