Viessmann VITODENS 200-W WB2B Series Start-Up/Service Instructions page 16

Initial Start-up and Service
Steps
(continued)
Sequence of operation and potential faults during each start-up cycle
Call for heat by control.
yes
Blower starts up.
yes
Ignition.
yes
Gas combination valve opens.
yes
Ionization current builds up / flame
established (symbol A appears).
yes
Burner is operating.
yes
Automatic calibration of
the combustion unit.
For further details regarding faults, see page 56.
16
Display message
no
Fault F9 after
no
approximately
51 seconds.
Fault F4/EE
no
Fault F4/EE
no
Fault F4/EE
no
Burner shuts off
when the boiler
no
temperature is
below the
selected boiler
set-point
temperature and
immediately
starts up again
(cycles).
Fault Eb
no
Corrective action
Increase boiler water set-point temperature
and ensure that there is heat demand.
Check cabling and plug-in connectors of
the blower, as well as the blower itself.
Check proper power supply to the blower.
Check ignition transformer (control voltage
230 V across plugs "X2.1" and "X2.2").
Check gas combination valve 230VRAC
(plug 35).Check gas supply pressure.
Check electrode settings, purge gas supply
line. Check condensate line and flue gas
system for leaks.
Check flue gas system for leakage (flue
gas recirculation), check running gas
pressure.
Check the connecting cable and the ioniza-
tion electrode, check the flue gas system
(flue gas recirculation). Press "Reset"