33
British Gas 4100 & 4125 RD2 -
Installation & Servicing
SERVICING
56 CONTROLS PANEL REPLACEMENT
1.
Remove the lower front panel/grille assembly and control
panel. Refer to Frame 47.
2.
Remove the control thermostat potentiometer. Refer to
Frame 55.
3.
Unclip the 'Burner On' neon from the lens holder.
4.
Fit the new control panel and re-assemble in reverse
order.
5.
Check the operation of the boiler.
57 FLAME DETECTION ELECTRODE AND LEAD REPLACEMENT
1.
Remove the lower front panel/grille assembly. Refer to
Frame 47.
2.
Remove the burner and controls assembly.
a.
Remove the control box cover.
b.
Unplug the HSI lead from the PCB and withdraw it from
the box.
c.
Disconnect the detection lead from the electrode.
d.
Remove the screw securing the control box to the
baseplate, slide to the left to release and place to one
side.
e.
Disconnect the electrical leads from the gas valve.
f.
Undo the gas service cock union.
g.
Remove the 4 wing nuts and withdraw the burner and
controls assembly, complete, from the boiler
3.
Remove the detection electrode retaining nut and
withdraw the electrode from the front plate.
4.
Fit the new electrode and reassemble in reverse order.
5.
Check that the position of the electrode relative to the
burner is correct.
6.
Check the operation of the boiler.
SER
VICING
