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Control Box Cover
Fig. 61
PCB
Selector
Switch
Facia
Selector Switch Knob
Fig. 62
DHW
Potentiometer
Control Knob
Drive Pin
DHW Relay
PCB
Temperature Control Knob
12.0 Changing Components
12.18
DHW Relay PCB (Fig. 62)
1. Undo the screws securing the DHW relay PCB
cover. Remove the cover.
2. Remove the screws securing the control box
cover and release the cover retaining barbs from
their slots. Disengage the rear of the cover from
the control box hinge pin.
3. Disconnect the live feed and neutral from the
external control at the relay PCB.
4. Disconnect the green wires from the 2-way
electrical connection block adjacent to the main
PCB. Undo the securing screws and remove the
relay PCB.
6. Reassemble in reverse order.
12.19
Main PCB (Fig. 62)
1. Note the setting of the temperature control
knob. Rotate the knob fully anticlockwise and
carefully pull it off the drive pin.
2. Remove the screws securing the control box
cover and release the cover retaining barbs from
their slots. Disengage the rear of the cover from
the control box hinge pin (Fig. 61).
3. Note the position of all plugs and wires on the
PCB and disconnect them.
4. Undo the securing screws and remove the
PCB. Transfer the control knob drive pin to the
new PCB and turn it fully anticlockwise.
5. Reassemble in reverse order, ensuring that the
temperature controller is reset to the previous
position.
6. Ensure that the DHW potentiometer is fully
anticlockwise once the new PCB is fitted.
12.20
Selector Switch (Fig. 62)
1. Note the setting of the selector switch knob and
carefully pull it off the facia.
2. Remove the screws securing the control box
cover and release the cover retaining barbs from
their slots. Disengage the rear of the cover from
the control box hinge pin.
3. Note the position of the electrical connections
and the orientation of the switch. Remove the
electrical connections.
4. Remove the screws securing the switch to the
facia panel.
5. Fit the new switch, ensuring that it is correctly
positioned and reassemble in reverse order.
37
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