Operating instructions

128
Dis-
played
fault
code
Const. Weath.-
comp.
System char-
acteristics
Cause Measures
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
and replace boiler
coding card or con-
trol unit if necessa-
ry.
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.)
5772 909 GB