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11.0 Changing Components
38
Centre
Pin
Retaining
Rivet
Fig. 106
Fig. 107
Fig. 108
Fig. 103
Fig. 105
Fig. 104
11.1
Changing Components
1. Before changing any components ensure that
the gas and electrical supplies are isolated.
2. Before changing any components please read
Section 1.3 Important Information.
3. Open the hinged lower door panel and carefully
disengage the door stay. Remove the door by
opening it 90
°
and pulling forward (see Fig.93).
4. Remove the outer case from the boiler by
unscrewing the two screws and lift the case clear.
11.2
Replacing the Circuit Board
1. Ensure that the electrical supply is isolated.
2. Undo the
1
/
4
turn screws and drop the facia
panel down (Fig. 104).
3. Remove the cover from the front of the controls
box (Fig. 103).
4. Release the supply and pump feed cables from
the cable clamps and unplug the connection
blocks from the circuit board (Fig. 105).
5. Remove the screw retaining the thermostat
control panel and slide the circuit board from the
box.
6. Carefully withdraw the centre pin from the
retaining rivet which then allows the retaining rivet
to be removed. Remove the thermostat control
panel (Fig. 106 & 107). (On reassembling ensure
the control panel is located over the retaining rivet
body before inserting the centre pin).
7. Disconnect the plugs from the sockets on the
circuit board (Fig. 108).
8. Replace new circuit board in reverse order
checking that the connections are correct as
shown in the diagram (See Electrical Connections
section 6.18 of these instructions) and that the
harness is retained in the strain reliefs.
11.3
Ignition Electrode (Fig. 109)
1. Disconnect the spark electrode lead at the
electrode.
2. Unscrew the electrode from the manifold and
withdraw the electrode.
3. Replace the new electrode in reverse order,
ensuring that the sleeving is pushed over the end
of the electrode.
Electrode
Fig. 109
British Gas Service
Test Point.
For use by B.G.
Personnel only
Facia Securing
Screws
Facia Panel
