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12.0 CHANGING COMPONENTS
IMPORTANT: When changing components
ensure that both the gas and electrical supplies to
the boiler are isolated before any work is started.
When the component has been changed turn the
selector switch fully anticlockwise against the
spring pressure to the reset position and hold for
2 seconds to reset the boiler before
recommissioning.
See Section 11.1 "Annual Servicing" for removal of
case panel, door etc.
12.1
Fan (Figs. 48 & 49)
1. Note the positions of the two sensing tubes on the
fan spigot and three wires on the fan motor and
remove them.
2. Slacken the screws on the fan spigot outlet pipe
clamps. Ease the clamps inwards over the pipe.
3. Draw the outlet pipe away from the boiler.
4. Remove the four screws securing the combustion
box door and remove the door.
5. Ease the front edge of the left hand baffle
upwards, disengaging the spring clip. Disengage the
tab on the baffle from the slot in the fan hood.
6. Undo the screws securing the fan hood to the
appliance back panel, and draw the fan and hood
assembly forwards.
7. Remove the screws and spring washers securing
the fan to the hood.
8. Fit the new fan to the hood using the screws and
spring washers previously removed.
9. Reassemble in reverse order of dismantling.
12.2
Pressure Switch (Fig. 47)
1. Remove the fan as described in section 12.1.
2. Note the positions of the two sensing tubes and
three wires and remove them.
3. Remove the two screws holding the pressure
switch to the bracket on the combustion box top
panel.
4. Fit the new pressure switch and reassemble all
components in reverse order of dismantling.
Pressure
Switch
-'ve
bk
b
Fig. 47
br
Pressure
Switch Wires
Fan Wires
Sensing
Tubes
Ease Fan Spigot Outlet
Pipe Clamps Inwards
Fan Spigot Outlet Pipe
Baffle
Spring Clip
Fig. 49
Spring Washer
Sensing
Tubes
+'ve
Fan
Fig. 48
Tab
Fan
Securing Screw
Fan Hood
29
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