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KEY
Red
Black
Blue
Brown
Green
Yellow
Green/Yellow
White
Orange
Grey
Red/White
Blue/White
bl/wh
P.C INTERFACE
X7
*
Do NOT connect
to these terminals
r/wh
X4
bl/wh
*
Ribbon cable
X8
CONTROL PANEL
FLOW N.T.C.
THERMISTOR
b
RETURN N.T.C.
THERMISTOR
b
b
HOT WATER N.T.C.
THERMISTOR
OUTSIDE
SENSOR
Schematic Wiring Diagram
13 Fault Finding
r
b
bl
br
gr
y
g/y
FLAME IGNITION AND
wh
IONISATION ELECTRODE
or
gy
r/wh
AUTOMATIC CONTROL MODULE
b
bl
wh
r
r
b
D.C. FAN
gr
1 gr
3 gr
AIR
PRESSURE
SWITCH
X1-1
X1-2
X1-3
X1-4
X1-5
INTERNAL
FUSES
F1=2AF
b
gy
r
b
wh
or
gr
r/wh
r/wh
bl
29
BLACK LOW
VOLTAGE PLUG
Room thermostat
Clock/timer
Frost thermostat
230V/50Hz
WHITE
MAINS PLUG
br
bl
CHASSIS
EARTH POINT
bl
g/y
br
PUMP
GAS
y
CONTROL
VALVE
br
bl
r
THREE WAY
VALVE
g/y
g/y
RESISTOR
220 / 7W
Diagram 13.1
221874A
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