Sequence Of Operation And Potential Faults During Each Start-Up Cycles - Viessmann VITODENS 222-F Service Instructions Manual

Start-up
Sequence of Operation and Potential Faults During Each Start-up Cycle
Call for heat by control
Fan starts up
Ignition
Gas train opens
Ionization current builds
Symbol A
Burner in operation
Automatic calibration of
the combustion controller
For further details regarding faults, see page 69.
18
yes
no
yes
no
yes
no
yes
no
yes
no
yes
no
Display message
no
After approx.
51 s fault F9
Fault EE
Fault EE
Fault EE
Stops below
the set boiler
water
temperature
and restarts
immediately
(cycles)
Fault E3
Fault EB
Vitodens 222-F B2TA 19 and 35 Service
Measures
Increase boiler water set-point
temperature and ensure that
there is heat demand
Check cabling and plug-in connector
of the fan, fan connecting cables,
power at the fan and fan control
Check the ignition module
(control voltage 120V across
plugs "X2.1" and "X2.2")
Fault EE Check the gas combination
valve (control voltage 120V); check
the gas supply pressure
Check the ionization electrode settings
and the condensate purge gas line
Check the flue gas system for leakage
(flue gas recirculation), check the gas
flow pressure
Ensure adequate heat transfer.
Press reset button R.
Check gap between ionization electrode
and burner gauze assembly. Check
allocation of gas type (coding address 82,
gas valve setting). Check flue gas system;
remedy flue gas recirculation if required.
Press reset button R.