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3 Unscrew the nuts "5" (Figure 18.1) and remove the cover of
the combustion chamber.
4 Remove the front insulation panel (see section "18.3 Remov-
al of the front insulation panel" on page 42).
5 Unscrew the screws "7" (Figure 18.4) and remove the burner.
6 Assemble the burner carrying out the removal operation in
reverse order. Ensure the burner is correctly located by lining
up the locating tab (Figure 18.4).
Burner
gasket
Burner
Locating tab
7
Figure 18 .4
Before reassembling ensure the burner gasket is correctly
located .
Warning: After cleaning or replacement as detailed
above, it is deemed necessary to undertake a com-
bustion analysis as detailed in section "11 .3 Adjust-
ment - Chimney Sweep Function" on page 30) .
18 .5 Removal of the rear insulation
See warning note at the end of this chapter before to remove
this part .
Attention: Cover the inner of the condensing heat
exchanger to avoid that dirt and debris fall in the
coil .
1 Do the operations of section "18.4 Removal of the burner" on
page 42 from step 1 to step 3.
2 Remove the insulation "8" by pulling it towards the boiler front
(Hung it with a screwdriver tip) (Figure 18.5).
IGNITION AND DETECTION ELECTRODES
8
Figure 18 .5
18 .6 Checks
Check of the spark generator.
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
There is not a significant way to verify the integrity of the spark
generator. When the fan turns but the burner does not light a
possible cause is a faulty spark generator on the main PCB. It
would be advisable to replace the Main PCB to rectify the fault.
Check the position of the electrode edges.
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Check for the correct distance between the metallic edge of
the electrode and burner (see Figure 18.6).
Figure 18 .6
Check the connection wires
4 mm
- 43 -
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