Worcester 26CDi XTRA Installation And Servicing Instructions page 24

Unhook the securing rods out of the locating holes in the
combustion chamber sides.
Ease the combustion chamber front and side assembly clear of
the appliance. See fig. 32. and 35.
(h) Burner Assembly
Hinge down the facia panel. Remove the inner casing cover and
combustion chamber front and sides assembly. Pull off the two
spark electrode leads. Disconnect the flame sensing lead at the
plastic fitting under the inner casing. See fig. 32 and 36.
Fig. 32. Appliance Components and Fixings (upper assembly)
Clear sensing tube
Automatic
air vent
Inner casing
Secondary
high efficient
heat exchanger
Flue hood fixing
screws
Central heating
sensor
Wing nuts (2) and
securing rods
fixing the combustion
chamber front and
sides cover
Spark electrode
assembly
Flame sensor
located within the
burner
Fan outlet
spigot
Red sensing tube
Fan fixing screw
to secondary heat
exchanger
Flue hood
Combustion chamber front and
NOTE:
The flame sensing lead is attached to the burner. When the
burner is removed ensure this lead is fed through the inner
casing. Remove the grommet seal to allow the plastic connection
to pass through the inner casing. Unscrew the G
top of the gas valve and retain the sealing washer. Unscrew the
front burner fixing screw. Lift the burner and ease the union nut
through the inner casing sealing grommet.
Remove the burner assembly clear of the inner casing. Ensure
the flame sensing lead passes through the base of the inner
casing. See fig. 32 and 36.
Detail of sensing
tubes
Fan
Assembly
sides cover
24
3 / union nut on
4
Fan fixing screws
(2)
Overheat
thermostat
Gas to water
heat exchanger
Burner assembly
Sealing grommit
3
Union nut (G / )
4
Burner fixing screw