Operating instructions

Fault
code
on the
display
Const. weath.-
comp.
System char-
acteristics
Cause Measures
F9 X X Burner in a
fault state
Fan speed
too low dur-
ing the burn-
er start
Check the fan,
check the fan
cables and sup-
ply; check the fan
control.
Press "E
RESET".
FA X X Burner in a
fault state
Fan not at
standstill
Check the fan, fan
connecting cables
and fan control.
Press "E
RESET".
FC X X Burner in a
fault state
Gas train
faulty or
faulty modu-
lation valve
control; or
flue gas path
blocked
Check the gas
train. Check the
flue gas system.
Press "E
RESET".
Fd X X Burner in a
fault state
Burner con-
trol unit fault
Check ignition
electrodes and
connecting
cables. Check
whether a strong
interference
(EMC) field exists
near the equip-
ment.
Press "E
RESET".
Replace control
unit if the fault
persists.
FE X X Burner
blocked or in a
fault state
Boiler coding
card or main
PCB faulty
Press "E
RESET". Replace
boiler coding card
or control unit if
the fault persists
Fault codes (cont.)
78
Troubleshooting
5692 672 GB