126
Dis-
played
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
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,
heating circuit 1
and remote control
settings (see
page 160)
dE
X
Control mode
without room
influence
Lead break,
room temper-
ature sensor,
heating circuit
2 (with mixer)
Check room tem-
perature sensor,
heating circuit 2
and remote control
settings (see
page 160)
dF
X
Control mode
without room
influence
Lead break,
room temper-
ature sensor,
heating circuit
3 (with mixer)
Check room tem-
perature sensor,
heating circuit 3
and remote control
settings (see
page 160)
E0
X
Control mode
Fault, exter-
nal LON sub-
scriber
Check connections
and LON subscrib-
ers
Troubleshooting
Fault codes
(cont.)
5585 174 GB