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41
221474C
C
NO
WATER
PRESSURE
SWITCH
TRANSFORMER
THERMISTOR
CH
CENTRAL HEATING
SELECTOR
SWITCH
r
bk
L
N
or
y
p gry
w
CN1
CN7
CN3
CN4
CN5
N
L
N
L
MAINS
b
b
br
gry
p
y
or
bk
r
gry
p
p
or
or
br
br
p
p
y
or
w
w
b
br
KEY:
w
b
bk
br
g/y
gry
or
v
r
y
p
- WHITE
- BLUE
- BLACK
- BROWN
- GREEN/YELLOW
- GREY
- ORANGE
- VIOLET
- RED
- YELLOW
- PURPLE
NC
FUSE 2AT
FUSE
3.15AT
MAIN CONTROL BOARD
USER CONTROL
BOARD
PUMP
N L
WIRING AS
DIAGRAM 4.12A
230V-50Hz PERMANENT
MAINS SUPPLY FUSED
AT 3A
Y P G/Y B BR
1 2 3 N (L)
screened
r
w
gry
b
y
g
p
FLOW SENSOR
1
4 5
6 7
8
BOILER
PROTECTION
THERMOSTAT
L N E
IGNITION UNIT
GAS VALVE
br
b
r
p
w
CONTROL
HOUSING
r
b
THERMISTOR
DHW
230V~ 50Hz
TXR
b
BOILER
OVERHEAT
CUT OFF
RESET
NVLO
INDICATOR
br
r
bk
w
DC
FAN
gry
gry
gry
gry
bk
y
or
r
bk
y
g/y
g/y
g/y
RESET NVLO
INDICATOR,VIEW
FROM REAR
or
b
b
p
y1 y2
y
y
b
br
FAN
DRIVER
BOARD
screened
r
w
gry
b
y
g
p
or
y
p
gry
CHASSIS
EARTH G/Y
CN2A
CN2B
CN8
4 Replacement of Parts
Diagram 4.11
6368