Fault
code
on the
display
Const.
weath.-
comp.
System char-
acteristics
Cause
Measures
F2
X
X
Burner in a
fault state
The tem-
perature lim-
iter has
responded.
Check the heating
system fill level.
Check the circula-
tion pump. Vent
the system.
Check the tem-
perature limiter
and connecting
cables.
Press "
E
RESET".
F3
X
X
Burner in a
fault state
Flame signal
is already
present at
burner start.
Check the ionisa-
tion electrode and
connecting cable.
Press "
E
RESET".
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.
Fault codes
(cont.)
80
Troubleshooting
5692
673
GB
Summary of Contents for VITODENS 300-W
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