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27
221504A
13.1 Electrical
Important. On completion of the Service/Fault Finding task
which has required the breaking and remaking of the electrical
connections the earth continuity, polarity, short circuit and
resistance to earth checks must be repeated using a suitable
multimeter.
Refer to Neon Indicators - “An Aid to Fault Finding” diagram
13.1, Functional Flow diagram 13.2, Boiler Fault Finding diagram
13.3, Pump Overrun Fault Finding diagram 13.4, and Pictorial
Wiring diagram 13.5.
13.2 Electrical Supply Failure
Failure of the electrical supply will cause the burner to go out.
Operation will normally resume on restoration of the electrical
supply. If the boiler does not relight after an electrical supply
failure the overheat device may need resetting.
Remove the controls cover and press the reset button on the
control box, see diagram 10.1.
If the cutoff operates at any other time press the reset button and
the burner should relight. If the fault persists refer to fault finding
chart.
KEY
bk BLACK w WHITE
br BROWN r RED
br BLUE y YELLOW
LL
br br
br
br
br
b
w
r
r
br b
bk b
v
y
y
b
b
b
(N/O) (C)
(N/C)
b
y
b
r
99
8
7
78
N
SL
SPARK
ELECTRODE
PUMP
PURPLE
O/H CUTOFF
CONTROL STAT
FAN N N
N
N
N
N
N
N
N
*
*
RED
LINK
THERMOSTAT
PUMP
OVERRUN
FUSE
TYPE F1A
1 AMP
63
AIR
PRESSURE
SWITCH
MAIN
SOLENOID
PILOT
SOLENOID
Remove red link between 9 & SL when fitting
a time control etc. (If no switch is fitted, link
will make the circulation pump run constantly)
AIR PRESSURE SWITCH CONNECTIONS
MAIN TERMINAL STRIP CONNECTIONS
CONTROL THERMOSTAT CONNECTIONS
PRINTED CIRCUIT BOARD CONNECTIONS
3325
Diagram 13.2
FUNCTIONAL FLOW WIRING
13 Fault Finding
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