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15 Replacement of Parts
15.1 General
IMPORTANT: The replacement of parts described in sections
15.5 to 15.9 and section 15.12 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 tted.
Replacement of parts must be carried out by a competent
person approved at the time by the Health and Safety
Executive.
Before replacing any parts the boiler 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
12.2.
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.
If the appliance site situation has sufcient side clearances
the side panels can be hinged sideways and removed to aid
replacement of parts.
To remove a side panel undo the three screws securing each
side panel to the boiler, two at the front and one at the top.
Draining of Boiler Heating Circuit
Drain down the Heating Circuit of the boiler only, by closing
the heating ow and return isolating valves, see diagram 8.1.
Attach a length of hose to the drain point and open the drain
valve, see diagram 8.1.
After replacing part, close the drain valve and remove the
hose. Open the heating ow and return isolating valves and
rell, vent and pressurise the heating circuit, see section 12.6.
Check for leaks.
Draining of Boiler Hot Water Circuit
Drain the Domestic Hot Water circuit by closing the cold-water
isolation valve on the wall mounting jig.
Open one or more hot water taps to drain the hot water circuit.
After replacing part open the cold-water isolation valve and
slowly open a hot water tap to remove air. Close the hot water
tap and check for any leaks.
15.2 Spark Electrode
For access, refer to section 15.1.
Refer to section 13.2 for removal.
Diagram 15.1
13274
15.3 Igniter Unit
For access, refer to section 15.1.
Remove ignition lead and electrical connections then remove
igniter unit by removing two securing screws, see diagram
15.1.
15.4 Ignition Lead
For access, refer to section 15.1.
Pull the spark plug style connector off the spark electrode,
refer to diagram 13.6. and the spade connector connected to
the igniter unit, see diagram 15.1.
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