134
Dis-
played
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
Fd
X
X
Burner in a fault
state and addi-
tional fault b7 is
displayed
Boiler coding
card is miss-
ing
Insert the boiler
coding card.
Press reset button
R
.
Replace control
unit if fault per-
sists.
Fd
X
X
Burner in a fault
state
Fault, burner
control unit
Check ignition
electrodes and
connecting cables.
Check whether a
strong interference
(EMC) field exists
near the appliance.
Press reset button
R
.
Replace control
unit if fault per-
sists.
FE
X
X
Burner blocked
or in a fault
state
Boiler coding
card or main
PCB faulty, or
incorrect boil-
er coding
card
Press reset button
R
. If the fault per-
sists, check the
boiler coding card
or replace it or the
control unit.
FF
X
X
Burner blocked
or in a fault
state
Internal fault
or reset but-
ton
R
blocked
Start the appliance
again. Replace the
control unit if the
appliance will not
restart.
Troubleshooting
Fault codes
(cont.)
5623 520 GB