Initial Start-up and Service
Call for heat by control.
Blower starts up.
Ignition.
Gas combination valve opens.
Ionization current builds up / flame
established (symbol
A
appears).
Burner is operating.
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 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.
Burner shuts off
when the boiler
temperature is
below the
selected boiler
set-point
temperature and
immediately
starts up again
(cycles).
Fault F4/EE
Fault F4/EE
yes
Corrective action
no
no
no
no
yes
yes
yes
yes
yes
Display message
no
no
Fault F9 after
approximately
51 seconds.
Check ignition transformer (control voltage
230 V across plugs “X2.1” and “X2.2”).
Fault F4/EE
no
Automatic calibration of
the combustion unit.
Check the connecting cable and the ioniza-
tion electrode, check the flue gas system
(flue gas recirculation). Press “Reset”
Fault Eb
16
Steps
(continued)
Sequence of operation and potential faults during each start-up cycle
For further details regarding faults, see page 55.
5
4
4
3
2
0
7
v
1
.5
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