SERVICING AND SPARES
6 720 815 725 (2015/05)
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8. SIPHON
To remove and replace the siphon:
▶ Pull condensate hose out of the trap.
▶ Remove siphon from the boiler.
▶ Fit the new siphon to the sump and ensure that condensate
discharge pipe is firmly connected to the outlet pipe work.
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
12. FAN ASSEMBLY
▶ Remove electrical connector from fan.
▶ Remove condensate trap (see page 41).
1. Undo the union connection (A) from the top of the gas valve.
▶ Remove wire clip (B) from air/gas adjustment assembly (C) then pull
gas pipe down.
2. Unscrew two screws (D).
3. Remove fan from boiler.
4. Remove three screws retaining the air/gas adjustment assembly (E).
▶ Reassemble with new fan ensuring that seals are correctly fitted.
Fig. 79 Fan assembly removal
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2.
1.
6720647361-35.2W
o
A
B
9.
10.
NOTICE:
Air/Gas ratio
▶ After re-assembly the combustion must be checked
using the procedure in the section “Setting the air/
gas ratio.”
▶ The setting of the gas ratio must be carried out by a
competent person.
Setting the air/gas ratio must not be attempted
unless the person carrying out the operation is
equipped with a combustion analyser conforming to
BS 7927 and is competent in its use.
6720647361-36.2W
o
B
C
A
D
2.
1.
E
8.
3.
4.
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