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10.0 Changing Components – Page 37
10.1 Changing Components
1. When changing components ensure that the gas and
electrical supplies are isolated before the work is started.
2. Before changing any components please read
Section 1.3 Important Information.
3. Remove the outer case lower door panel (Fig. 98).
4. Remove the outer case from the boiler by unscrewing
the two screws and lift the case clear (Fig 99).
10.2 Replacing the Circuit Board
1. Ensure that the electrical supply is isolated.
2. Remove the cover from the front of the controls box
(Fig. 100).
3. Release the mains cables from the cable clamps and
unplug the mains connection blocks from the circuit board
(Fig. 101).
4. Remove the screw retaining the thermostat control
panel and slide the circuit board from the box.
5. Carefully withdraw the centre pin from the retaining rivet
which then allows the retaining rivet to be removed.
Remove the thermostat control panel (Fig. 102). (On
reassembling ensure the control panel is located over the
retaining rivet body before inserting the centre pin.)
6. Disconnect the plugs from the sockets on the circuit
board (Fig. 103).
7. Replace new circuit board in reverse order checking
that the connections are correct as shown in the diagram
(See Electrical Connections section 5.17 of these
instructions) and that the harness is retained in the strain
reliefs.
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