Worcester 24SiII - Page 10

Control Board
10
Fig. 12. Wiring diagram.
Fan
Flame sense
electrode
Spark
electrode
Spark
Generator
Mains in
Link
CH sensor
(front of heat
exchanger)
Flow
turbine
ST16
2 blue
green
2 green
brown
blue
blue
brown
white
red
yellow
ST2
ST15
ST1
Pump
Gas valve
2 green
white
black
Overheat cut-off
device
DHW sensor
Air
Pressure
Switch
black
black
green
Safety
valve
red
green/yellow
2 brown
Safety
valve
Regulator
valve
Earth tabs
small tab=L high speed (red)
medium tab = L low speed (white)
large tab=N (black)
ST5
Code Plug
black
red
black
blue
black
blue