Viessmann Vitodens 300 - Page 13

Yes
Differential pre s-
sure sensor
enables start
(0.75 V across
terminals X8.5
and X8.6)
No
After approx.
51 seconds
Check fan cables
and fan plug -in
connectio ns,
check fan
Fault
E6
Yes
Ignition
No
Fault Check the ig nition
module (contr ol
voltage 230 V
across plug s X2.1
and X2.2)
F4
Yes
Gas combinati on
valve opens
No
Fault Check the ga s
train (control vol -
tage 230 V) and
gassupplypres-
sure
F4
Yes
Ionisation cur-
rent build s
(higher t han
5µA)
No
Fault Check the io nisa-
tion current, the
electrode adjust-
ment and the gas
pipe for air locksSymbol A
F4
Yes
Operational bur-
ner
Stops below se t
boiler tempera-
ture and restarts
Check flue gas
system for sound-
ness (flue gas
recirculation),
check gas flow
pressur e
Further details regarding the individual steps (cont.)
13
Initial start-up, inspection, maintenance
5692 537 GB