12.0 Changing Components
35
12.18
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.
12.19
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.
Control Box Cover
PCB
Selector
Switch
Facia
Selector Switch Knob
Temperature Control Knob
Fig. 61
Fig. 62
Control Knob
Drive Pin
DHW
Potentiometer
Summary of Contents for Performa System 12e
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