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17 Routine Cleaning and Inspection
17.7 Combustion chamber cover
• Unscrew and remove the two screws securing combustion
chamber cover to combustion chamber,
see diagram 17.5
.
• Remove combustion chamber cover from boiler.
17.8 Spark and Sense Gaps
• Check that the spark and sense gaps as shown in
diagram
17.6.
Note: To gain access to spark and sense electrodes for
removal, refer to
Section, 20.12 and 20.13 in Replacement of
Parts
.
17.9 Burner, refer to diagram 17.7
• Unscrew and remove the two burner retaining screws.
• Remove burner from boiler by easing it forward off the two
burner guides, taking care not to damage the insulation.
• Clean burner by washing in soapy water. Dry thoroughly
before refitting.
Note: To gain access to injectors for removal and cleaning,
refer to
Section, 20.9.
17.10 Fan, refer to diagram 17.8
• Disconnect power supply leads and earth lead from fan.
• Disconnect the electrical plug from the fan sensor.
• Unscrew and remove the two fan retaining bolts.
• Ease the fan down and forwards to remove.
17.11 Heat exchanger, refer to diagram 17.9
• Remove air pressure switch sensing tube from the side of the
flue hood.
• Unscrew and remove the two retaining screws from front of
each side panel.
• Unhook each panel from the front retaining tabs and ease
outwards.
• Remove the flue hood. When refitting ensure the rear of the
flue hood locates in the tabs.
• Use a soft brush or vacuum clean the heat exchanger.
DO NOT USE ANY TOOL LIKELY TO DAMAGE PAINTED
FINISH OF HEAT EXCHANGER.
17.12 Domestic water inlet filter, refer to
diagram 17.10
If the water flow rate through the appliance has reduced it may
be necessary to clean or replace the domestic water inlet filter.
• Close isolating valve
(b)
on cold water inlet.
• Pull out slotted clip securing the filter in its housing, remove the
filter to clean or renew if necessary.
Push the filter fully into its housing and replace the securing clip.
• Open isolating valve
(b)
on cold water inlet and test the
Domestic Hot Water circuit for soundness.
17.13 Central Heating Filter, refer to diagram
17.11
Remove the filter retaining clip and filter clean or renew if
necessary
.
Push the filter fully into its housing, ensuring the correct
orientation. The flat and hole in the filter as shown. Secure with
retaining clip.
17.14 Sealed Chamber Cover - Seal Check
Check the condition of the seal, replace as required.
To replace remove the old seal, thoroughly clean the casing
sufaces. Fit the new seal, it is supplied to the correct length,
see diagram 20.29.
17.15 Combustion Chamber Insulation
Check the condition of the combustion chamber insulation.
If renewing,
refer to Section 20.15.
17.16 Flue system
• Check externally to make sure that flue is not blocked
• Inspect flue system to make sure that all fittings are secure.
17.17 Reassembly of parts removed for
servicing
All parts are replaced in reverse order to removal.
3.5mm
3.5mm
SPARK GAP
SENSE GAP
Diagram 17.6
11559
Diagram 17.5
3.5 mm
9811
9816
