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9.3
Specific maintenance instructions
Fig.47
Remove detection/spark ignition
electrode
Fig.48
Remove NTC flue sensor
Fig.49
Remove flow and return sensors
Warning
When changing components ensure that both the gas and
electrical supplies to the boiler are isolated before any work is
started. When the component has been changed recommission
the boiler. Always examine any seals or gaskets, replacing where
necessary. The case font panel MUST seal effectively against the
boiler side panels.
To remove the case front panel proceed as follows:
Unscrew the two screws located on the bottom of the front panel.
Slide the bottom of the front panel forward and lift upwards to disengage
the panel.
Hinge down the control panel.
9.3.1
Detection/spark ignition electrode
1. Disconnect the electrode lead and earthing cable.
2. Using a T15 Torx key, remove the retaining screws securing the
electrode to the combustion chamber door and remove the electrode,
noting its orientation.
3. Fit the new electrode with the sealing gasket.
4. Reassemble in reverse order.
PN-0000331
9.3.2
NTC flue sensor
1. Turn the sensor 90° anticlockwise to remove — it is a bayonet
connection.
2. Ease the retaining tab on the sensor away and disconnect the
electrical plug.
3. Fit new sensor and reassemble in reverse order.
PN-0000332
9.3.3
Flow and return sensors
There is one sensor on the flow (red wires) and one sensor on the return
(blue wires).
1. After noting the position of each sensors, prise the sensor clip off the
pipe and disconnect the plug.
2. Connect the plug to the new sensor and ease the clip onto the pipe in
its original position.
PN-0000384
9 Maintenance
51
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