Yes
Ignition
No
Fault F4
Check the ignition
module (control
voltage 230 V
across plugs
"X2.1" and
"X2.2")
Yes
Gas train opens
No
Fault F4
Check the gas
train (control vol-
tage 230 V);
check the gas
supply pressure
Yes
Ionisation cur-
rent builds
Symbol
A
No
Fault F4
Check the ionisa-
tion electrode ad-
justment and the
gas pipe for air-
locks
Yes
Burner in opera-
tion
No
Stops below the
set boiler water
temperature and
restarts immedi-
ately
Check the flue
gas system for
soundness (flue
gas recirculation),
check the gas
flow pressure
Yes
Automatic cali-
bration of the
combustion con-
trol unit
No
Fault Eb
Check the con-
necting cable and
the ionisation
electrode,
check the flue gas
system (flue gas
recirculation)
Further details regarding the individual steps
(cont.)
13
Commissioning, inspection, maintenance
5692
673
GB
Summary of Contents for VITODENS 300-W
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