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10
Maintenance
10.2 Standard inspection and Maintenance Operation (cont.)
Fig. 46b
Fig. 46c
Fig. 46e
50
600 Heat
Fig. 46a
Spark Ignition
Earth
Gasket
Electrode
Wire
Burner
Gasket
Fig. 46d
Over Centre
Catches
An ESD wrist strap should be used when working on
these components.
A T25 screwdriver will be required.
5. Remove the air duct by pulling the bottom of the duct forward
to disengage it from the gas valve and then sliding the top of the
duct left away from the fan (see 10.3.4).
6. Disengage the clip at the top of the flue duct, pull the duct
forwards and then manoeuvre it out of the heat exchanger sump
connection.
7. Disconnect the cable from the bottom of the PCB, disengage
the fan protective cover securing tab and lower the cover.
8. Taking care not to touch the PCB components, disconnect the
electrode lead, earth lead, mains power cable and the main
sensor harness from the board. Re-engage the fan protective
cover.
9. Disconnect the plug from the gas valve and undo the nut on
the gas inlet pipe at the base of the valve.
10. Remove the gas assembly (Fig. 46b) from the boiler by
releasing the over-centre catches (Fig. 46a) that secure it to the
heat exchanger.
11. Remove the ignition electrode (Fig 46c) and check the
condition. Replace if necessary.
12. Remove the gasket and burner from the top of the heat
exchanger (Fig. 46d). Use a suitable vacuum cleaner to clean the
top part of the heat exchanger (Fig. 46e).
13. The burner does not require any maintenance but must be
checked for cracks or deterioration, and replaced if necessary.
CaUTiOn
Ensure that all seals and gaskets are in position.
Ensure that all connectors are refitted to the PCB.
14. Reassemble in reverse order and recommission the boiler.
7726858-01 (1/19)
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