39
mexico HE
-
Installation & Servicing
Servicing
62 MAINs sWITCh REpLACEMENT
1.
Refer to Frame 51.
2.
Remove the boiler upper front panel. Refer to Frame 44.
3.
Remove the screws retaining the user control. Refer to
Frame 60, No. 3.
4.
Push out the mains switch from the rear, as shown.
5.
Refit the new switch, ensuring that the electrical leads are
replaced on the correct terminals and the key on the switch is
correctly aligned with the slot in the plastic moulding.
6.
Reassemble in reverse order.
7.
Check operation of the boiler. Refer to Frame 51.
60 CONTROL BOx REpLACEMENT
1.
Refer to Frame 51.
2.
Remove the boiler upper front panel. Refer to Frame 44.
3.
Remove the 2 control box mounting bracket screws.
4.
Pull the control box forward. Carefully unplug all the electrical
wiring from the control box.
5.
To remove the user control from the assembly pull the control
forward to disconnect the plug.
6.
Transfer the mounting brackets to the new control box.
7.
Reassemble in reverse order.
8.
Check operation of the boiler. Refer to Frame 51.
N.B. To change the user control only.
9.
Loosen the screw on the underside of the user
control.
10.
Pull the display unit forward to remove.
11.
Push the new display unit into position.
12.
Reassemble in reverse order.
13.
Check the operation of the boiler. Refer to
Frame 51.
mxhe7699
Mounting brackets
Control box
9
10
5
6
61 WIRINg hARNEss REpLACEMENT
A pictorial wiring diagram is shown in Frame 36.
1.
Refer to frame 51
2.
Remove the boiler upper front panel. Refer to frame 44
3.
Remove the sealing panel. Refer to frame 45
4.
Disconnect the wiring harness from the Fan, Controls Box, Flow
Thermistor, Spark Generator, Gas Valve, Overheat Thermistor, Dry
Fire Thermistor, and Earth post.
5.
Remove the condensate pump terminal strip securing screw to
gain access to the back of the terminal strips.
6.
With an Allan key remove the ‘rivscrew’ from the back of the
brackets to release the terminal block.
7.
Reassemble the new harness to the brackets in reverse order.
s
ER
VICIN
g
3
4
5
Red
Brown
Electrical
connections
6
Summary of Contents for he15
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