113
Displayed
fault code
System characteris-
tics
Cause
Measures
Fd
Burner in a fault
state
Fault, burner con-
trol 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 the
fault persists.
FE
Burner blocked or in a
fault state
Boiler coding card
or main PCB faulty
Press reset button
R
.
Replace boiler coding
card or control unit if the
fault persists.
FF
Burner blocked or in a
fault state
Internal fault or
reset button
R
blocked
Start the appliance again.
Replace the control unit if
the appliance will not
restart.
Troubleshooting
Fault codes
(cont.)
5412 755 GB
Service