Electronic control p.c.b.
22
Fig. 36
4
Unscrew the four screws that hold the Electronic
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 control p.c.b. fol-
lowing the removal procedures in the reverse
order.
Important
When re---assembling the Electronic 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. 37) reaches the potentio-
meter edge. It is not necessary to force them in
the knob.
9
While tightening the screws that fix the Electronic
control p.c.b. on the control panel, keep the
p.c.b. towards the control panel fascia making
sure of the contact between the boiler reset but-
ton
B
and the tab
C
(Fig. 37).
A
B
C
Fig. 37
Attention
After installing the Electronic control p.c.b. :
10
Make sure the c.h. ( ) and d.h.w. ( ) tempera-
ture adjustment knobs can move freely for the
complete range.
If not, remove the spindle again as described at
step 3, turn the knob half a turn and re---insert the
spindle.
11
Operate the boiler and close the gas inlet cock so
that the boiler goes into the safety lock---out state.
Verify the correct operation of the boiler reset but-
ton by pressing and releasing it.
Warning: After cleaning or replacement as
detailed above refer to section
Combustion
analysis check
in the chapter
Maintenance
of
the installation instructions manual.
