Unit installation

9.0 Changing Components
22
9.1 Changing Components
1. To change any components on the back boiler
it is necessary to remove the fire front.
2. After changing any components carry out gas
soundness checks.
9.2 Removal of Firefront
1. Isolate the electrical supply to the appliance.
2. Turn the thermostat knob to the off position
(Fig. 52).
3. Turn the gas service tap to the off position
(Fig. 50).
4. Refer to the separate firefront instructions for
the removal of the firefront.
The following components can be changed
with the controls in situ :- Lint Arrestor,
Thermostat Sensor, Thermostat
Potentiometer and P.C.B.
9.3 Lint Arrestor
1. Remove the lint arrestor by pulling forward
away from its retaining clips (Fig. 49).
2. Reassemble in reverse order.
9.4 Thermostat Sensor (Fig. 49 & 50).
1. Remove controls heat shield.
2. Remove the thermostat sensor & retaining
strip from the boiler.
3. Undo the three screws retaining the control
box cover and remove the cover.
4. Disconnect the thermostat sensor plug from
the PCB.
5. Reassemble in reverse order.
9.5 Thermostat Potentiometer (Fig. 51).
1. Remove the controls heat shield from its
retaining clips.
2. Undo the three screws retaining the control
box cover and remove the cover.
3. Disconnect the thermostat potentiometer plug
from the PCB and remove the potentiometer
wires from their guide slot in the control box side.
4. Undo the screw holding the thermostat
potentiometer to the controls mounting bracket
and remove the potentiometer by disengaging its
locating tab.
5. Reassemble in reverse order.
Gas Cock
Off Position
Fig. 48
Lint Arrestor
Controls Heat Shield
Thermostat Sensor
Guide Slot
Control Box Cover
Control Box
Retaining Strip
Control Box Cover
Control Box
Guide Slot
Thermostat Potentiometer
Fig. 49
Fig. 50
Fig. 51