Quick Start Manual

10.0 Changing Components

Centre

Retaining

Rivet

Fig. 108

Fig. 109

Fig. 110

Fig. 111

Fig. 112

Fig. 113

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. 108).

4. Remove the outer case from the boiler by unscrewing

the two screws and lift the case clear (Fig 109).

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. 110).

3. Release the mains cables from the cable clamps and

unplug the mains connection blocks from the circuit

board (Fig. 111).

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. 112). (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. 113).

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.

British Gas Service Test

Point.

For use by B.G.

Personnel only