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14 Replacement of Parts
14.1 General
IMPORTANT: The replacement parts described in sections
14.5 to 14.9 and section 14.12, will require the removal of the
burner module assembly and the replacement of the burner
door seal and self locking nuts.
Replacement parts that have associated components that
need replacing on removal, i.e. ‘O’ ring, seals, gasket, etc.,
will be supplied and should be fitted.
Replacement of parts must be carried out by a competent
person.
Before replacing any parts of the boiler it should be isolated
from the mains electric supply and the gas should be turned
off at the gas service isolation valve on the boiler, see
diagram 12.4.
Unless stated otherwise parts are replaced in the reverse
order to removal.
After replacing any parts always test for gas tightness and if
necessary carry out functional test of the controls.
Boiler Access
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 and removed 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 at the top.
14.2 Spark Electrode
For access, refer to section 14.1.
Refer to section 12.4 for removal.
14.3 Igniter Unit
For access, refer to section 14.1.
Remove ignition lead and electrical connections then remove
igniter unit by removing two securing screws, see diagram
14.1.
14.4 Ignition Lead
For access, refer to section 14.1.
Refer to diagram 12.5 and 12.6.
Pull the spark plug style connector off the spark electrode
and the spade connector connected to the igniter unit.
14.5 Gas Valve
For access, refer to section 14.1.
Refer to section 12.5 for removal of the fan, gas valve and
burner assembly.
Before removing the gas valve note its position on the fan.
Remove the three securing screws, which fix the gas valve
and plastic swirl plate to the venturi on the fan, see diagram
14.2.
Diagram 14.1
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