Display
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Remedy
F8
X
X
Burner control
unit fault
The fuel
valve closes
too late.
Check the gas
train. Check both
control paths.
Press "
E
".
F9
X
X
Burner control
unit fault
Fan speed
too low dur-
ing burner
start
Check the fan,
check the fan
cables and sup-
ply, check the fan
control.
Press "
E
".
FA
X
X
Burner control
unit fault
Fan not at
standstill
Check the fan, fan
connecting cables
and fan control.
Press "
E
".
FC
X
X
Burner control
unit fault
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
".
Fd
X
X
Burner control
unit fault
Faulty burn-
er control
unit or boiler
coding card
Check ignition
electrodes and
connecting
cables. Check
whether a strong
interference
(EMC) field exists
near the equip-
ment.
Press "
E
".
If the fault cannot
be removed,
check the boiler
coding card or re-
place it, if re-
quired or replace
the control unit.
Fault codes
(cont.)
82
Troubleshooting
5692
569
GB
Содержание Vitodens 300
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