45
sERVICING
Ideal Logic Combi -
Installation and Servicing
4
60 MaIN PCB REPLaCEMENT
Note.
Fit the earth strap provided with the PCB to
your wrist and secure to a suitable earth on the boiler
chassis.
1.
Refer to Frame 49.
2.
Note the control knob positions.
3.
Remove the 2 screws retaining the control box cover.
4.
Carefully lift the 4 retaining clips and remove
control box cover.
5.
Unplug all lead connections to the PCB including
the ribbon cable (to facilitate ribbon cable removal,
ease side clips apart and pull upwards), also where
applicable, push the small plastic clip with an
electrical screwdriver to facilitate plug removal.
6.
Spring out the two side retaining clips and pull the
PCB upwards to clear the 4 corner retaining posts.
7.
Take the new Primary PCB and attach the
appropriate Boiler Chip Card (BCC) to it (this should
correspond to the output of the boiler: 24kW, 30kW
or 35kW).
Note.
Ensure the correct orientation of
BCC by placing “TOP” side up as shown.
8.
Re-connect all plug connections.
9.
Reassemble in reverse order.
10.
Turn power back on to the boiler, after a few
moments the display will start alternating between
“c” and “0”. Turn the reset knob fully clockwise and
when the display shows “ - ” turn the knob fully anti-
clockwise IMMEDIATELY.
Finally move the knob into the required position
(Standby, Summer or Winter).
3
6
5
Plastic clip
5
1.
Refer to Frame 49.
2.
Remove the main PCB, refer to Frame 60.
3.
Unclip the PCB and lift to clear the mounting posts.
4.
Fit the new PCB ensuring the 4 potentiometer spindles
line up with the control knobs which must be in a
vertical position.
5.
Reassemble in reverse order.
6.
Check operation of the boiler. Refer to Frames 38 & 39.
61 UsER CONTROL PCB REPLaCEMENT
3
Potentiometer spindle
Control Knobs (to be in vertical position)
PCB
4
Ribbon
Cable
Connection
7
Note that production boiler PCBs are factory pre-set to operate for boiler range and
output, but when ordering Primary PCB as a spare, an additional Boiler Chip Card
(BCC) MUST also be purchased for your specific boiler range and output.
Note.
Fit the earth strap provided with the PCB to
your wrist and a suitable earth on the boiler chassis.
11.
Check operation of the boiler. Refer to Frames 38 & 39.
s
ER
VICING
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Summary of Contents for LOGIC+ Combi 24
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