Worcester 28Si

10
Fig. 11. Wiring diagram.
Fan
Flame sense
electrode
Air
pressure switch
Spark
electrode
Spark
transformer
Mains in
Link
Control Board
CH sensor
(front of heat
exchanger)
Flow
switch
ST16
2 blue
2 orange
2 brown
brown
blue
blue
brown
2 violet
white
2 red
2 yellow
2
pink
ST12
ST8
ST15
ST1
Pump
Gas valve
Reg
Main
Main
2 green
brown
yellow
Overheat cut-off
device
DHW sensor