Checks; Removal Of The Electronic Control P.c.b - Biasi Riva Plus HE M296.24SR/C Service Manual

Where:
figure 8 .22
8 Rotate the knob B on a position corresponding to an ade-
quate ignition pressure.
Refer to the value indicated in the tables of the User/Installa-
tion manual (Technical information section, Gas pressures at
the burner table).
By rotating clockwise the pressure increases.
9 Make a note of the position of the knob B.
10 Turn the boiler OFF and ON positioning the function selector
knob A as indicated in Figure 8.23
f
figure 8 .23
11 Keep pressed the reset button D for about 10 seconds until
the lock-out signal lamp E blinks.
12 Press the reset button D repeatedly (4 times) until the lamps
F give the indication as in Figure 8.24 (ignition pressure ad-
justment mode).
Where:
figure 8 .24
13 Turn the knob B to the minimum (fully counterclockwise) and
then on the position corresponding to the position obtained
on step 8.
By turning the knob B, the lock-out signal lamp E blinks quick-
ly (2 per second) indicating that the setting has changed and
must be memorised.
14 To memorize the setting keep pressed the reset button D for
about 5 seconds until the lights F briefly blinks simultane-
ously.
15 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.

8 .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 8.2) are
complete.
If a fuse has blown replace it with one that has the same charac-
teristics after having identified the reason for failure.
Lock sequence
ElEctronic control/ignition p.c.b.
Lamp OFF
Flashing lamp, alone
or simultaneously
with an other lamp
a d
b
Lamp OFF
Lamp ON
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
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.
8 .11 removal of the electronic control p .c .b
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/
e
ignition p.c.b..
To disconnect the connectors x1, x6 and x7 (1, 2 and 3 in Fig-
ure 8.2) delicately flex the hook present on one side of each
socket.
To disconnect the connectors x4 and x2 (4 and 5 in Figure
8.2) 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 8.25.
figure 8 .25
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.
important
When re-assembling the Electronic control/ignition p.c.b.:
7 Fit the p.c.b. into the control panel by first inserting the front
lower edge under the control knob shafts. Lower the rear
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