Worcester 24i: OK on DHW; on CH pump runs but boiler doesn't fire. If DWH drawn at same time then gets some CH but user not happy with that as workaround(!).
I can't see any flow sensor telling the boiler that the pump is running, either physically on the boiler or in the manual, so I assume it has to be the PCB. Geoff can you (a) sanity check me here, and (b) do me a new PCB?