Worcester 24ijunior Installation And Servicing Instructions page 11

Fig. 9. Wiring diagram.
Air
Pressure
Switch
CH
sensor
Flow
turbine
ST2
Mains in
Spark
electrode
DHW
sensor
Spark
Generator
green/yellow
ST15
Link
Fan
Black 6.3mm tag Common
White 4.8mm tag Low Speed
Red
Gas valve
Regulator
Valve
Safety
Valve
Safety
Valve
Control Board
ST1
2 yellow
2 green
2 red
11
Overheat cut-off device
2.8mm tag High Speed
Flame
sense
electrode
Pump
ST16
2 brown
2 blue
2 orange
2 violet
white