5
4
4
6
6
7
1. See Section 3.2.
2. Refer to Section 3.8.
3. Disconnect 2 ag terminals from the ue thermostat.
4. Undo the two screws and remove the sump cover.
5. Lift the manifold to clear the bottom sealing gasket and remove
manifold.
6. Remove the 2 front xing screws and loosen the 2 rear extended
nuts.
7. Lift off the burner from the combustion chamber. To facilitate the
removal angle the burner as shown.
8. Fit the new burner, replacing any damaged or deteriorating sealing
gasket.
9. Reassemble in reverse order. Refer to Section 3.7.
10. Check the operation of the boiler. Refer to Sections 2.23 & 3.24.
3.10 BURNER INJECTOR REPLACEMENT
1. Refer to Section 3.8.
2. Disconnect the electrical leads from the fan.
3. Remove the clip from the gas valve to
venturi pipe and ease the pipe upwards,
rotate and ease down to remove.
4. Loosen the screw retaining the fan
mounting bracket.
5. Lift and remove the fan and venturi
assembly.
6. Remove the 2 injector housing screws.
7. Withdraw the injector housing.
8. Fit the new injector housing complete with
injector.
9. Reassemble in reverse order, ensuring
that the new gas seal supplied is located
correctly in the injector housing.
10. Check that the boiler operates in both DHW
& CH modes.
2
4
3
6
Injector
3.11 BURNER REPLACEMENT
SERVICING
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