13
6.7.1
PRINTED CIRCUIT BOARD (PCB) (see fig. 17)
Carry out component removal procedure as de-
scribed in 6.4.
Remove the appliance casing as described in
4.7.1. Carefully slide out the control panel until
the lugs on the lower right and left side of the
panel are free from the slots on the appliance
frame. Remove the electrode lead from its clip on
the PCB housing. Locate and remove the two
screws which secure the PCB cover & terminal
cover, then remove cover, after carefully taking
note of all wiring connections, disconnect all
wiring from the PCB, locate and remove the PCB
securing screws, remove PCB.
Replace in the reverse order.
NOTE
Ensure that the replacement PCB has the correct
“Jumper Tag” configuration (see section 8).
6.8
GAS VALVE (see fig. 16)
Carry out component removal procedure as de-
scribed in 6.4. Remove the appliance casing as
described in 4.7.1.
The gas valve must be changed as complete unit.
Disconnect the electrical plug and leads from the
gas valve. Disconnect compensator tube from
gas valve regulator. Slacken and unscrew gas
valve inlet and outlet connections. Please note,
the sealing washers must be discarded and re-
placed with new sealing washers. Locate and
remove gas valve retaining screws on the
underside of the appliance. The gas valve can
now be removed. Replace in the reverse order.
Check and adjust burner pressure settings.
WARNING, A GAS SOUNDNESS CHECK
MUST BE CARRIED OUT.
6.9
BURNER, INJECTORS AND SPARK/SENSE
ELECTRODE (see fig. 18a,b,c)
Carry out component removal procedure as de-
scribed in 6.4. Remove the appliance casing as
described in 4.7.1.
Locate and remove the ten screws that secure
the air chamber cover. Remove the air chamber
cover. Locate and remove the 5 screws securing
the front combustion cover and retaining plate,
pull the cover towards you before lowering and
disengaging.
Disconnect the electrode lead from its connector.
Disconnect the gas valve outlet pipe from its
connection to the burner. Slacken and remove
the lock-nut that secures the burner assembly to
the air chamber base. The burner can now be
removed. With the burner assembly removed,
slacken and remove the burner bar retaining clips
in order to gain access to the injectors. Replace
in the reverse order. Please note, the injector
sealing washers must be replaced if the injectors
have been removed, ensure all seals are in good
condition, taking care to ensure they are replaced
correctly.
6.10
FLUE FAN (see fig. 19)
Carry out component removal procedure as
described in 6.4. Remove the appliance casing
as described in 4.7.1.
Locate and remove the 10 screws that secure the
air chamber cover. Remove the air chamber cover.
Locate and remove the 4 screws that secure the
flue assembly. Disconnect the electrical
connections and silicone tubes attached to the
fan, noting their positions. Disconnect the
maintainence clip that secures the flue outlet pipe
to the fan, ease the fan & flue hood assembly from
its location. Locate and remove the screws that
secure the fan to the flue hood. Remove the fan
Fig. 17
Fig. 18a
Fig. 18b
Fig. 18c
