20
2000225008D
8 Servicing
8.1 Access
Remove the boiler front casing panel, refer to section 6.8.
Remove the bottom plinth panel by unscrewing the two dog
point screws securing the panel to the boiler plinth, see diagram
8.4.
Disconnect gas valve from gas cock and unplug electrical plug
from gas valve, firstly removing electrical plug securing screw,
see diagram 8.2.
Unclip electrical wires from control box support bracket, see
diagram 8.3.
Undo the four self-tapping screws that secure the combustion
chamber front and carefully withdraw it together with the burner
and gas valve assembly, taking care not to strain the ignition
and earth wire, see diagram 8.5.
Note: When replacing burner in combustion chamber make
sure it fits correctly on the guides.
Disconnect the ignition and earth leads from the burner and
remove by drawing the leads though the grommet, see diagram
8.5.
Remove the three self-tapping screws from the lower part of the
control box support bracket, see diagram 8.6.
Undo the wing nut that secures the top of the heat shield and
carefully hinge down control box and heat shield, see diagram
8.6.
Release the two toggle latches that secure the fan access door
and remove, see diagram 8.7.
Note: When replacing the fan access door make sure the lip at
the top of door fits into and behind the slotted bracket located at
the top of the boiler.
Remove the electrical connections from the fan by pulling the
insulation boots only.
Disconnect the two silicone tubes from the fan taking note of
their positions.
Note: To ease removal of the right hand baffle from the heat
exchanger, remove both silicone tubes from the air pressure
switch.
Remove fan securing screw, electrical connections and air
pressure tubes, then remove fan and flue hood by sliding back
to disengage the retaining lugs then lift up.
Remove the flue hood.
When replacing the flue hood ensure that it rests on the guides
and that the rear of flue hood is located under the pegs at the
rear and pushed down and back fully.
IMPORTANT: When re-fitting fan check that it fits fully into the
flue duct extension piece.
Diagram 8.4
BOTTOM PLINTH
PANEL
SECURING SCREWS
Diagram 8.5
COMBUSTION
CHAMBER
COVER
IGNITION AND
EARTH LEADS
GROMMET
