Fault
code
on the
display
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
F4
X
X
Burner in a
fault state
No flame sig-
nal.
Check the ionisa-
tion electrode and
cable, measure
the ionisation cur-
rent, check the
gas pressure,
check the gas
train, ignition,
ignition module,
ignition electro-
des and the con-
densate drain.
Press "
E
RESET".
F7
X
X
Burner
blocked
Short circuit
or water
pressure
sensor lead
broken
Check the water
pressure sensor
and the intercon-
necting cable.
F8
X
X
Burner in a
fault state
The fuel
valve closes
too late.
Check the gas
train. Check both
control paths.
Press "
E
RESET".
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".
Fault codes
(cont.)
79
Troubleshooting
5692
761
GB
Содержание Vitodens 200-W WB2B Series
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