SERVICING AND SPARES
6 720 815 724 (2015/11)44
7. Gas valve
▶ Isolate gas supply at boiler gas cock.
▶ Pull out air inlet tube (A).
▶ Undo top gas connection (B) to gas valve.
▶ Undo bottom gas connection (C) to gas valve.
▶ Undo two securing screws (D)on the underside of casing.
▶ Pull valve up and forward out of boiler.
▶ Disconnect electrical connections.
▶ Replace valve with new seals and check for gas soundness.
Fig. 75 Gas valve removal
8. Siphon/condensation trap
1. Pull condensate hose out of the trap.
2. Remove trap from boiler.
▶ Clean trap and check that the connection to the heat exchanger is
clear.
▶ Fill the condensate trap with approximately 1/4 litre of water and
refit in reverse order.
Fig. 76 Siphon removal
9. Access to boiler control components
▶ Remove 3 screws (A) and remove cover from control.
10. PCB fuse
▶ Remove fuse (B) from the PCB and replace.
▶ There is a spare fuse clipped into the cover.
Fig. 77 Component and fuse access
11. PCB removal
To gain access to the PCB:
▶ Remove the five screws shown in the diagram below and remove the
PCB cover.
Fig. 78 PCB access
The valve will require setting, follow procedure “Setting
the gas/air ratio” in the gas conversion section.
7.
A
B
D
C
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2.
1.
6720647361-35.2Wo
A
B
9.
10.
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