Glow-worm Energy Saver Combi 2 and Gas Valve - Manual (Page 28)

28 221854B
12.11 Heat Exchanger - Major Servicing
Refer to Fault Finding sections 13.1, (fault code
0
and
8
.) and
13.4 before carrying out a major service of the heat exchanger.
If it is suspected that the heat exchanger has become partially
blocked internally, proceed as follows.
Remove the burner and fan as described in section 12.3.
Remove the wire clip from the internal flue adaptor, see diagram
7.5.
Push the adaptor pipe downwards into the boiler flue pipe,
disengaging it from the flue elbow.
Remove the boiler flue pipe.
Check for any blockage in the boiler flue pipe and remove any
debris.
Check for any blockage in the casting flue outlet orifice and
remove any debris.
Place a suitable container below the condense drain and
remove the cap. See section 12.5.
Using a suitable torx screwdriver, remove the heat exchanger
top panel screws, see diagram 12.9. Take care when removing
the screws and washers, not to drop them behind the heat
exchanger.
Carefully prise open the boiler top.
Replace the boiler flue pipe.
Place a water hose into the top of the heat exchanger, taking
care not to damage the insulation to the rear, see diagram
12.10.
Thoroughly flush the heat exchanger from above and collect the
water and any debris in the container beneath the condense
drain.
Flush the heat exchanger until the water appears clear at the
condense drain.
Check the condition of the heat exchanger top gasket and
replace if necessary.
Rebuild the boiler.
Repeat the combustion test as detailed in section 12.6.
If the combustion is still unacceptable then the heat exchanger
will need to be replaced. Refer to section 14.19 and remove the
heat exchanger.
HEAT
EXCHANGER
Diagram 12.9
9065
HOSE
Diagram 12.10
9066
TORX
SCREWS
(6 OFF)
Air Vent Pipe
removed for clarity
INSULATION
Air Vent Pipe
removed for clarity
12 Servicing