Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 47

Further details regarding the individual steps
Yes
Gas train opens
Yes
Ionisation current
builds
Symbol A
Yes
Burner in opera-
tion
No
Fault EE
No Fault EE
No Stops below the
set boiler water
temperature and
restarts immedi-
ately
Commissioning, inspection, maintenance
(cont.)
Check the gas train
(control voltage
230 V) and gas
supply pressure
Check the ionisa-
tion electrode ad-
justment and the
gas line for air-
locks.
Check the flue sys-
tem for tightness
(flue gas recircula-
tion); check the gas
flow pressure
47