Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 32

Commissioning, inspection, maintenance
Further details regarding the individual steps
Yes
Ignition
Yes
Gas train opens
Yes
Ionisation cur-
rent builds
Symbol A
Yes
Burner in opera- No
tion
Yes
Automatic cali-
bration of the
combustion con-
trol unit
32
Fault F4
No
Fault F4
No
Fault F4
No
Stops below the
set boiler water
temperature and
restarts immedi-
ately
Fault Eb
No
(cont.)
Check the ignition
module (control
voltage 230 V
across plugs
"X2.1" and
"X2.2")
Check the gas
train (control vol-
tage 230 V);
check the gas
supply pressure
Check the ionisa-
tion electrode ad-
justment and the
gas pipe for air-
locks
Check the flue
gas system for
soundness (flue
gas recirculation),
check the gas
flow pressure
Check the con-
necting cable and
the ionisation
electrode,
check the flue gas
system (flue gas
recirculation)