15.4.11
Transformer
Remove the cabinet and lower the facia panel as described in
Section 14, Inspection and Servicing.
Unscrew the four screws and remove the metal cover. Refer to Fig
54.
Pull out the transformer. Refer to Fig 56.
15.4.12
Clock/Programmer
Remove the clock/programmer assembly by carefully pulling it
from the facia to release the clips. Unplug the connector at the
control board. Comprehensive instructions are sent with the new
control. Refer to Fig 57.
15.4.13
Fan
Remove the inner casing.
Remove the fan as described in Section 14.3, Inspection and
Servicing. Ensure that all the connections are correctly made to
the new fan.
15.4.14
Air Flow Detector
Remove the fan as described in 15.3.13 preceding.
Unscrew and , through the fan outlet, withdraw the airflow
detector. Refer to Fig 42.
15.4.15
Primary [CH] Sensor
Remove the cabinet and inner casing.
Carefully pull-off the connections.
Withdraw the clip and lift off the sensor. Refer to Fig 58.
Do not omit the heat transfer paste when fitting the replacement
sensor.
15.4.16
Overheat Thermostat
Remove the cabinet and the inner casing.
Carefully pull-off the connections. Unscrew the two screws and
remove the sensor. Refer to Fig 58.
Apply a small quantity of heat transfer paste to the face of the
replacement sensor.
Carefully reposition the sensor so that the connections are away
from the flue hood. Reconnect the sensor.
15.4.17
DHW Sensor
Remove the cabinet and lower the facia.
Carefully pull off the connections. Unscrew the clip and remove
the sensor.
Apply a small quantity of heat transfer paste to the face of the
replacement sensor.
Refer to Fig 59.
26
Fig.58. Primary sensor and overheat
thermostat
Fig.59. Domestic hot water sensor
Fixing screws
Overheat
thermostat
leads
(orange)
Overheat
thermostat
Mounting
plate
Mounting
plate
Flue hood
Primary
sensor leads
(red)
Primary
sensor
Fixing clip
Air flow
switch
Fixing
screws
Sensor leads
(yellow)
Fixing clip
Domestic hot
water
temperature
sensor
Domestic hot
water
flow
pipe
Cenral heating
flow pipe
Fig.57. Programmer connection
Facia
Programmer
connector
Programmer
connections
Clip
Programmer
Pressure gauge
Control
board
Fig.56. Transformer
Facia
Transformer
Control board