Checks; Removal Of The Electronic Control P.c.b - Biasi RIVA COMPACT M90E.24S Service Manual

5 Connect the C.h. temperature probe NTC
(Fig. 23)
Fig. 24
6 Press the reset button C repeatedly (4 times) until
the lamps E give the indication as in Fig. 24 ---
Fig. 25 (gas type mode).
Where:
Fig. 25
At this step it is possible to visualize the current setting
by keeping the reset button C pressed for more than 5
seconds. The lamps E will flash a number of times
corresponding to the setting (Fig. 26 --- Fig. 27).
Gas type
Setting No.
NATURAL
1
GAS
Fig. 26
7 To change the setting turn the knob B on a posi-
tion corresponding to the desidered delay.
By turning the knob B, the lock ---out signal lamp
D blinks quickly (2 per seconds) indicating that
the setting has changed and must be memo-
rised.
Gas supply Position of knob B
Natural gas 1
L.P .G. 4
Fig. 27
8 To memorize the setting keep pressed the reset
button C for about 5 seconds until the lights E
briefly blinks simultaneously.
9 To reset the boiler to the normal operation turn it
ON by the function selector knob A. In any case,
the boiler automatically resets to its normal oper-
ation after 10 minutes.
Factory setting = Natural gas
ON
LD1 LD2 LD3
E
Lamp OFF
Lamp ON
L.P .G.
4
B
Approx. Max current
through the modu-
lator device
125 mA
165 mA
Electronic starting control p.c.b.
9.10

Checks

Check that the fuse is complete
n
If the Electronic starting control p.c.b. does not supply
any device (pump, fan, etc.) check that the fuse 2
(Fig. 2) is complete.
If the fuse has blown replace it with one that has the
same characteristics after having identified the reason
for failure.
Check the setting jumpers position
n
Two setting jumpers must be fitted on the Electronic
starting control p.c.b. as shown in NO TAG.
9.11

Removal of the electronic control p.c.b

Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
1 Gain access to the parts located inside the con-
trol panel as explained in the section 2.3 of this
manual.
2 Remove all the wiring connected to the Electronic
starting control p.c.b..
To disconnect the connectors J1, J3, J7, J15, J16
and (5, 1, 9, 15 and 6 in Fig. 2) delicately flex the
hook present on one side of each socket.
3 Remove the spindles of the c.h. and d.h.w. tem-
perature adjustment knobs by delicately pulling
them with pliers in the direction shown by the
arrow in Fig. 28.
Fig. 28
4 Unscrew the four screws that hold the Electronic
starting control 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 starting control
p.c.b. following the removal procedures in the re-
verse order.
Important
When re---assembling the Electronic starting control
p.c.b.:
7 Fit the p.c.b. into the control panel by first insert-
ing the front lower edge under the control knob
shafts. Lower the rear edge and ensure that no
wiring is trapped beneath.
8 Insert the spindles in the control panel knobs un-
till the notch A (Fig. 29) reaches the potentio-
19