Operating instructions

110
Dis-
played
fault
code
Const. Weath.-
comp.
System char-
acteristics
Cause Measures
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 144)
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 144)
dF X Control mode
without room
influence
Lead break,
room temper-
ature sensor,
heating circuit
3 (with mixer)
Check room tem-
perature sensor for
heating circuit 3
and remote control
settings (see
page 144)
E0 X Control mode Fault external
LON sub-
scriber
Check connections
and LON subscrib-
ers
E4 X X Burner blocked Fault, supply
voltage 24 V
Replace the control
unit.
E5 X X Burner blocked Fault, flame
amplifier
Replace the control
unit.
E8 X X Burner in a fault
state
The ionisa-
tion current
lies outside
the permissi-
ble range
Check the ionisa-
tion electrode and
cable.
Press reset button
R.
EA X X Burner in a fault
state
The ionisa-
tion current
lies outside
the permissi-
ble range dur-
ing calibra-
tion
Check the ionisa-
tion electrode and
cable.
Press reset button
R.
Troubleshooting
Fault codes
(cont.)
5457 552 GB