SERVICING AND SPARES
6 720 815 725 (2015/05)
46
13. ELECTRODE ASSEMBLY
▶ Disconnect spark electrodes and flame sensor connection.
▶ Remove two screws (F).
▶ Remove spark/flame electrode assembly (G) from heat exchanger.
▶ Inspect the spark/flame electrode assembly and ceramics for signs of
contamination or damage, replace as necessary.
▶ If necessary, clean the spark/flame electrode assembly with a plastic
scouring pad.
▶ Replace electrode gasket and heatshield.
▶ Re-assemble with the new gasket and secure with the screws (F)
removed earlier.
Fig. 80 Electrode assembly
14. AIR/GAS MANIFOLD
1. Remove cover panel (A) by removing screws (B).
▶ Check that the boiler is completely isolated from the gas supply.
Fig. 81 Top panel
2. Remove clips (C) and unscrew the two bolts (D).
▶ Unscrew and remove the two hexagon screws (E) securing the fan.
▶ Slacken fully the rear securing bolt (F).
Fig. 82 Release air/gas manifold
3. Remove air/gas manifold (I)
Fig. 83 Air/gas manifold
4. Open air/gas manifold (I).
▶ Carefully withdraw diaphragm (J) from fan intake tube and check for
soiling and splits.
Fig. 84 Diaphragm
WARNING:
Electrode gasket
▶ Do not remove the electrode assembly unless a new
gasket and heatshield are available for re-assembly.
WARNING:
Air/Gas manifold
▶ Do not remove the manifold unless a new gasket is
available for re-assembly.
13
G
F
6 720 812 175-20.1O
A
B
6 720 812 175-15.1O
B
1.
F
C
D
2.
6 720 812 175-16.1O
H
G
E
E
3.
J
I
K
I
4.
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