Worcester PCB Control
part no 87161023390
it will fit to following:-
Worcester Hiflo400 Electronic BSN NG Combi
Worcester Hiflo400 Electronic FSN NG Combi
Worcester Hiflo400 Electronic FSP NG Combi
Worcester Hiflo400 Electronic OSN NG Combi
Worcester Hiflo400 Electronic OSN NG Combi