Ribbon Cable Connection
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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 42.
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: 15kW, 18kW, 24kW
or 30kW). 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. a. Turn power on
b. Displays “8” blue light on/off, “rst
digit input”, “second digit input”, “1st
letter appliance type”, i.e. “2”, “4”, “s”
c. Move knob to required setting
(standby, summer, winter)
Note. If no BCC tted on non
programmed board items c & 2 will be
displayed. The correct BCC for this
appliance will need to be tted.
11. Check operation of the boiler. Refer to
Frames 31 & 32.
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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 specic boiler range and output.
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