
SERVICING
mini HE
--- Installation & Servicing
39
55 MAIN CONTROL PCB
REPLACEMENT
1 Disconnect the electrical supply.
2 Gain access to the controls area by removing the boiler
front panel and pulling the control panel (refer to frame
22).
3 Remove the screws A and remove the service panel
4 To gain access to the main control p.c.b. and the ignition
p.c.b. remove the screws B and remove the control panel
lid.
B
A
Control panel lid
Service panel
B
5 Remove all the wiring connected to the main control p.c.b.
To disconnect the connectors indicated, delicately flex the
hook present on one side of each socket.
6 Remove the spindles of the CH and DHW temperature
adjustment knobs by delicately pulling them with pliers in
the direction shown by the arrow.
7 Unscrew the four screws that hold the main control p.c.b.
on to the control panel.
8 Remove it by lifting its rear edge and freeing it from any of
the wiring.
9 Re---assemble in reverse order.
Setting jumpers
Two setting jumpers C are fitted on the main control p.c.b.
Refer to the following illustration for the position of the
jumpers when the main control p.c.b. is fitted.
The numbers refer to the marking printed on the circuit board.
1 2 3 4 5 6 7 8 9
Important
When re---assembling the electronic control p.c.b.:
10 Fit the p.c.b. into the control panel by first inserting the
front lower edge under the control knob shafts. Lower the
rear edge and ensure that no wiring is trapped beneath.
11 Insert the spindles in the control panel knobs until the
notch D reaches the potentiometer edge. It is not
necessary to force them in the knob.
12 While tightening the screws that fix the main 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 button E and the tab F.
Replace the wiring connections ensuring correct
engagement in the sockets
D
E
F
C
Attention
After installing the main control p.c.b.:
13 Make sure the CH (
) and DHW (
) temperature
adjustment knobs can move freely for the complete
range. If not, remove the spindle again as described at
step NO TAG, turn the knob half a turn and re---insert the
spindle.
14 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 button by
pressing and releasing it.
15 Open the gas inlet cock and check the boiler operates
correctly.
S
E
R
V
IC
IN
G
Содержание mini HE C24
Страница 2: ...2 mini HE Installation Servicing ...