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16.1 General
Replacement of parts must be carried out by a competent
person.
Before replacing any parts the boiler should be isolated from the
mains electric supply and the gas should be turned off at the gas
isolation valve on the boiler, see (F28e) diagram 9.1. or
(F28e SB) diagram 9.1a.
Unless stated otherwise parts are replaced in the reverse order
to removal.
After replacing any parts always test for gas soundness and if
necessary carry out functional test of the controls.
For replacement of parts the front casing and the inner casing
panel of the boiler will need to be removed. To remove undo the
two screws on the underside of the front casing and lift off. Undo
the two screws on the front of the inner front panel and lift off.
The side panels can be hinged sideways to aid replacement of
parts.
To hinge a side panel undo and remove the three screws
securing each side panel to the boiler, two at the front and one
on the top.
16.2 Spark Electrode
For access, refer to section 16.1.
Remove the spark plug lead and two securing screws. Withdraw
the spark electrode carefully from the combustion chamber,
see diagram 13.2.
16.3 Igniter Unit
For access, refer to section 16.1.
Remove ignition lead and electrical connection then remove
igniter unit by removing the securing screw, see diagram 16.1.
16.4 Ignition Lead
For access, refer to section 16.1.
Refer to diagram 13.2.
Pull the spark plug connector off the spark electrode and the
connector to the igniter unit, see diagram 16.1.
IGNITION LEAD
CONNECTOR
ELECTRICAL
CONNECTOR
IGNITER
UNIT
SECURING
SCREW
16 Replacement of Parts
16.5 DC Fan supply
For access, refer to section 16.1.
Refer to diagram 16.2.
Unplug electrical connection from the DC fan supply.
Drop down control panel and undo the three screws securing
rear cover and lift up, see diagram 11.1.
Unplug DC fan supply lead from main PCB, see diagram 16.3.
Release cable grip located on boiler case.
Undo the screw securing DC fan supply and unhook from the
rear of securing bracket.
Remove DC fan supply and lead.
When reconnecting electrical connection to DC fan supply do
not force on connector.
DC FAN
SUPPLY
Diagram 16.1
47
ELECTRICAL
CONNECTION
SECURING
SECURING
SCREW
BRACKET
DC FAN SUPPLY
CONNECTION
RETAINING CLIPS
FUSE
Diagram 16.2
FUSE
Diagram 16.3
2000225242A
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