how is a worcester 9/24 combi boiler wired in?

It's an awfully BIG question and might take ages to answer.

If you say why you need to know or what the specific problem is you will be more likely to get a sensible reply.

If you still have the installation documents they will have wiring diagrams.

Is it not a 19-24 rather than a 9/24 as you say?

Q how is a worcester 9/24 combi boiler wired in?
A Fused and switched spur to ring main

see what I mean?

Peccavi
January 2009