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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.
7. IMPORTANT: Turn the selector switch fully anticlockwise against the spring
pressure to position R and hold for at least 3 seconds to reset the boiler.
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.
Page 37
12.21 Central Heating Differential Valve
(Figs. 63
& 64)
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