41
221051B
41
SECTION
11
Fault Finding
2914
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 Fault Finding, Wiring and
Functional Flow diagrams.
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 front panel as Section 1,
Step 1 and press the reset button on the
top of the electrical controls box cover,
see diagram at Step 3.
If the cutoff operates at any other time,
press the rest button and the burner
should relight. If the fault persists refer
to Fault Finding chart.
(N/C)
br
FUSE
TYPE F1
1 AMP
AIR PRESSURE SWITCH CONNECTIONS
SPARK
ELECTRODE
O/H CUTOFF
CONTROL STAT
FAN
AIR
PRESSURE
SWITCH
PILOT
SOLENOID
MAIN
SOLENOID
10
10
10
10
N
1
2
3
(N/O)
(C)
L
6
3
(N)
(SL)
(N)
(N)
(N)
(L)
b
w
br
y
y
r
v
r
bk
b
y
b
b
bk
b
KEY
bk BLACK
br BROWN
b BLUE
v
VIOLET
p
PURPLE
w WHITE
r RED
y YELLOW
12
MAIN TERMINAL STRIP CONNECTIONS
CONTROL THERMOSTAT CONNECTIONS
PRINTED CIRCUIT BOARD CONNECTIONS
8
7
9
8
7
9
11
PUMP
br
b
br
r
br
br
THERMOSTAT
PUMP
OVERRUN
p
b
b
*
RED
LINK
*
RED LINK may have been removed
to fit remote controls.
