Help needed for Baxi 105 he instant DHW preheat

[richstany]

Hi
The preheat has stopped working on my boiler. Following the manual I checked continuity across the loop in connector A10 and after finding this ok replaced the pcb part number 248731.
The preheat function still does not work. Does anyone know of any other sensors etc that could cause this? And any advice on the next steps to take?
thanks

 

[richstany]

Apologies please ignore. It's turns out I hadn't located connector A11 correctly - now works fine

 

[Agile]

So are you convinced that the pcb was the cause of the fault?

Tony

 

[richstany]

Yes, out of interest I refitted the old board making sure the A11 loop had continuity and it still did not work

 

[Agile]

I am slightly surprised because most lack of preheat faults that I see are non pcb causes.

Tony