And each of those "engineers" is an idiot desperate for work.
I would never fit a that type of part based on anothers diagnosis.
It's a £100 part and a very simple job on this boiler. Half the time I've replaced diverters the flow o ring connection to the primary heat ex. has leaked so I know how easy the job is. Bleed rads, drop pressure, pump up vessel, replace aav (they're always leaking), remove fan , swap heat ex, replace the lot, presurise, safety checks....hours work tops.
I would never fit a that type of part based on anothers diagnosis.
It's a £100 part and a very simple job on this boiler. Half the time I've replaced diverters the flow o ring connection to the primary heat ex. has leaked so I know how easy the job is. Bleed rads, drop pressure, pump up vessel, replace aav (they're always leaking), remove fan , swap heat ex, replace the lot, presurise, safety checks....hours work tops.