Fault
code
on the
display
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
F0
X
X
Burner
blocked
Internal fault
Replace the con-
trol unit
F1
X
X
Burner in a
fault state
Flue gas
temperature
limiter has
responded
Check flue gas
path/route; press
"
E
"
F2
X
X
Burner in a
fault state
The tem-
perature lim-
iter has
responded
Check the heating
system fill level,
the circulation
pump, the tem-
perature limiter
and interconnect-
ing cables/leads;
vent the system;
press "
E
"
F3
X
X
Burner in a
fault state
Flame signal
is already
present at
burner start
Check the ionisa-
tion electrode and
interconnecting
lead; press "
E
"
F4
X
X
Burner in a
fault state
No flame sig-
nal.
Check the ionisa-
tion electrode,
ignition, ignition
module, intercon-
necting cables/
leads, gas pres-
sure, gas train
and the ionisation
current;
press "
E
"
F7
X
X
Burner
blocked
Differential
pressure
sensor faulty
Check differential
pressure sensor
and lead
F8
X
X
Burner in a
fault state
The fuel
valve closes
too late
Check the gas
train and both
control paths;
press "
E
"
Fault codes
(cont.)
80
Troubleshooting
5692
731
GB
Summary of Contents for VITODENS 333-F WS3A
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