Supplied By www.heating spares.co Tel. 0161 620 6677
31
221504A
Diagram 14.1
CABLE TIES
14 Replacement of Parts
GLAND PLATE
SECURING
SCREW
CABLE TIES
Notes
Replacement of parts must be carried out by a competent
person.
Before replacing any parts isolate the boiler from the electrical
supply and turn the gas supply off at the gas service cock, see
diagram 10.1.
Unless stated otherwise, all parts are replaced in the reverse
order to removal.
After replacing any parts always test for gas soundness and if
necessary carry out functional check of controls.
14.1 Pilot Burner Assembly
Gain access as the servicing section “Heat Exchanger”.
14.2 Electrode Assembly
Gain access as the servicing Section “Heat Exchanger” and
“Pilot Burner/Electrode and Pilot Injector”.
Remove the electrode securing screw to release the electrode.
14.3 Ignition Lead
Gain access as the servicing section “Heat Exchanger”.
Remove the control box, refer to Section 9.
Loosen the cable ties, see diagram 14.1.
Pull off the ignition lead at the control board (PCB) and electrode.
Release but do not remove the gland plate securing screw, see
diagram 14.1 and pass the lead through and secure as the one
removed.
3327
Diagram 14.2
CONTROL BOARD (PCB)
CONTROL
THERMOSTAT
ELECTRICAL
NO.6 "YELLOW" CABLE
CHASIS
EARTH
CONNECTION
IGNITION
LEAD
MAIN TERMINAL
STRIP SECURING
SCREW (2)
ELECTRICAL
CONNECTION
SL BROWN CABLE
ELECTRICAL
CONNECTION
N BLUE CABLE
PLASTIC RETAINING
CLIP
3328
ELECTRICAL
PLUGS
SUPPORT
POST (2)
OVERHEAT
CUTOFF
ELECTRICAL
CONNECTION
"WHITE" CABLE
14.4 Control Board (PCB): Diagram 14.2.
Remove the control box, refer to Section 9.
Disconnect the three electrical plugs and ignition lead.
Release the cables from the plastic retaining clip and disconnect
the cables, including the earth connection, from the PCB to the
main terminal strip, boiler thermostat and overheat cutoff.
Release the main terminal strip and plastic insulation.
Carefully pull the board away from its supports.
When refitting refer to wiring diagram 13.5.
14.5 Control Thermostat and Overheat Cutoff:
Diagram 14.3.
Remove the inner case.
Remove the control box, refer to Section 9.
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