Viessmann VITODENs 200 Installation Instructions Manual page 29

Further details regarding the individual steps
Yes
Air pressure lim-
iter enables start
(contact closed
between term-
inals X8.10 and
X8.11)
Yes
Ignition
Yes
Gas combination
valve opens
Yes
Ionisation cur-
rent builds
(higher than
5 µA)
symbol A
Initial start-up, inspection, maintenance
After approx.
51 seconds
No
fault
E6
Fault
No
F4
Fault
No
F4
Fault
No
F4
(cont.)
Check fan cables
and fan plug-in
connections,
check fan
Check the ignition
module (control
voltage 230 V
across plugs X2.1
and X2.2)
Check the gas
combination valve
(control voltage
230 V), check the
gas supply pres-
sure
Check the ionisa-
tion current,
check the elec-
trode adjustment
and the gas pipe
for airlocks
13