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F
B
Figure 10 .20
3 Keep pressed the reset button D for about 10 seconds until
the lock-out signal lamp E blinks.
4 Press the reset button D repeatedly (4 times) until the lamps
F give the indication as in Figure 10.21 (setting the d.h.w.
flowmeter mode operation).
Where:
Figure 10 .21
At this step it is possible to visualize the current setting by keep-
ing the reset button D pressed for more than 5 seconds. The
lamps F will flash a number of times corresponding to the setting
(Figure 10.22).
5 Change the setting by turning the knob B on the position cor-
responding to the desired setting (Figure 10.22).
By turning the knob B, the lock-out signal lamp E blinks quick-
ly (2 per seconds) indicating that the setting has changed and
must be memorised.
6 To memorize the setting keep pressed the reset button D for
about 5 seconds until the lights F briefly blinks simultane-
ously.
1
Figure 10 .22
At this step it is possible to visualize the current setting by keep-
ing the reset button D pressed for more than 5 seconds. The
lamps F will flash a number of times corresponding to the setting
of Figure 10.22 that must be seven times.
7 To reset the boiler to the normal operation turn it OFF and ON
by the function selector knob A checking the ignition pressure
and that the burner lights up uniformly. In any case, the boiler
automatically resets to its normal operation after 10 minutes.
10 .10
Checks
Check that the fuses are complete
If the Electronic control/ignition p.c.b. does not supply any de-
vice (pump, fan, etc.) check that the fuses 14 (Figure 10.2) are
complete.
If a fuse has blown replace it with one that has the same charac-
- 24 -
ELECTRONIC CONTROL/IGNITION P.C.B.
A
D
Lamp OFF
Lamp ON
D.H.W.
FLOWMETER
4
7 flashes
7
B
Setting No.
teristics after having identified the reason for failure.
Lock sequence
Start the boiler until the burner is ignited.
With the burner firing, interrupt the gas supply. The Electronic
control/ignition p.c.b. must carry out three complete ignition cy-
cles and then, after about 3 minutes, goes to lock-out state.
By turning the boiler on and off by means of the function switch
E
the device must not unlock and the burner must not turn on.
Fan functioning device
With the boiler operating and the burner on, open the positive
pressure test point of the Fan pressure connection devise. After
opening it the burner must turn off.
10 .11
Warning: isolate the boiler from the mains electric-
ity supply before removing any covering or compo-
nent .
When replacing the Electronic control/ignition p .c .b . it is ad-
visable to go through the setting modes of the boiler .
1 Gain access to the parts located inside the control panel as
explained in the section "Control panel" page 5 of this manu-
al.
2 Remove all the wiring connected to the Electronic control/
ignition p.c.b..
To disconnect the connectors x1, x6 and x7 (1, 2 and 3 in
Figure 10.2) delicately flex the hook present on one side of
each socket.
To disconnect the connectors x4 and x2 (4 and 5 in Figure
10.2) press delicately the hook present on one side of each
connector.
3 Remove the spindles of the c.h. and d.h.w. temperature ad-
justment knobs by delicately pulling them with pliers in the
direction shown by the arrows in Figure 10.23.
Figure 10 .23
4 Unscrew the four screws that hold the Electronic control/igni-
tion p.c.b. on to the control panel.
5 Remove it by lifting its rear edge and freeing it from any of the
wiring.
6 Re-assemble the Electronic control/ignition p.c.b. following
the removal procedures in the reverse order.
Removal of the electronic control p .c .b
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