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51 MAIN PCB REPLACEMENT
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 secure to a suitable
earth on the boiler chassis.
1. Refer to Frame 41.
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, "first 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 fitted on non programmed
board items c & 2 will be displayed. The
correct BCC for this appliance will need to be
fitted.
11. Check operation of the boiler. Refer to
Frames 30 & 31.
44
SERVICING
3
5
Ribbon Cable Connection
4
7
Installation and Servicing
6
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