103
Dis-
played
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
d6
X
X
Control mode
Input DE1
fault at exten-
sion EA1
Check connection
to input DE1
d7
X
X
Control mode
Input DE2
fault at exten-
sion EA1
Check connection
to input DE2
d8
X
X
Control mode
Input DE3
fault at exten-
sion EA1
Check connection
to input DE3
dA
X
Control mode
without room
influence
Short circuit,
room temper-
ature sensor,
heating circuit
1 (without
mixer)
Check room tem-
perature sensor,
heating circuit 1
db
X
Control mode
without room
influence
Short circuit,
room temper-
ature sensor,
heating circuit
2 (with mixer)
Check room tem-
perature sensor,
heating circuit 2
dC
X
Control mode
without room
influence
Short circuit,
room temper-
ature sensor,
heating circuit
3 (with mixer)
Check room tem-
perature sensor,
heating circuit 3
dd
X
Control mode
without room
influence
Lead break,
room temper-
ature sensor,
heating circuit
1 (without
mixer)
Check room tem-
perature sensor for
heating circuit 1
and remote control
settings (see
page 132)
dE
X
Control mode
without room
influence
Lead break,
room temper-
ature sensor,
heating circuit
2 (with mixer)
Check room tem-
perature sensor for
heating circuit 2
and remote control
settings (see
page 132)
Troubleshooting
Fault codes
(cont.)
5692 843 GB