SERVICING
Mini
--- Installation & Servicing
40
56 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
21).
3 Remove the screws A and remove the service panel
4 To gain access to the electronic control/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 To disconnect the connectors indicated in the next figure,
delicately press the hook present on one side of each
socket.
7 Remove the spindles of the two control knobs by
delicately pulling them with pliers in the direction shown
by the arrows.
8 Unscrew the four screws that hold the electronic
control/ignition p.c.b. on to the control panel.
9 Remove it by lifting its rear edge and freeing it from any of
the wiring.
10 Re---assemble in reverse order.
Important
When re---assembling the electronic control/ignition p.c.b.:
11 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.
12 Insert the spindles in the control panel knobs until the
notch C reaches the potentiometer edge. It is not
necessary to force them in the knob.
13 While tightening the screws that fix the electronic
control/ignition 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 D and the tab E.
Replace the wiring connections ensuring correct
engagement in the sockets.
C
C
D
E
Attention
After installing the electronic control/ignition p.c.b.:
Combi boilers (Mini C24, Mini C28, Mini C32)
14 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 7, turn the knob half a turn and re---insert the spindle.
System boilers (Mini S24, Mini S28)
14 Make sure the CH (
) temperature and Service (
)
adjustment knobs can move freely for the complete
range. If not, remove the spindle again as described at
step 7, turn the knob half a turn and re---insert the spindle.
SER
VI
CI
N
G
