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7.13 Spark or flame detection electrode
(fig. 31)
• Isolate gas and electricity supply
• Remove outer case (two screws bottom rear
corners)
• Open room sealed compartment and
combustion chamber
• Identify electrode from fig. 31
• Unplug electrical connection "A" from sensing
electrode
• Remove fixing screw and remove flame
detection electrode
• Remove the two fixing screw from spark
electrode plate and remove it.
7.14 D.H.W. flowmeter
• Isolate electricity and water supplies
• Open a hot water tap to release water
pressure from the domestic side of the heat
exchanger, close tap.
• Remove outer case (two screws bottom rear
corners).
• Remove two screws from control panel and tilt
forward
• Take off protective cover from main PCB and
unplug flow meter lead from terminal X6
• Place a piece of cloth or some other
absorbent material over rear of control panel to
catch any drops of water that may be released
when removing the flow meter
• Using a 24mm open ended spanner, undo flow
meter unions "A" and "B" taking care not to
twist the copper tubing (access through base
panel).
• Remove flow meter, check + clean filter +
restrictor + fit to new flow meter.
• Reassemble in reverse order.
Observe the correct position of
components as shown in fig. 32b
Key
37
Cold water inlet filter
38
Gasket
39
Cold water flow limiter
DOMINA 102 DGT
Flame
detect
A
Fig. 31
A
37
38
39
38
Spark
Fig. 32a
B
Fig. 32b
29
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