I just thought I'd answer my own question in case anyone else stumbles upon this... The culprit was the return unit as suspected (part No. 8 716 106 442 0) and the PRV was also leaking. To replace it I removed the hydraulic block to make t easier to work on. The replacement part only comes...
Righto, removed the flow adapter and it basically disintegrated in my hand, I cleaned the bits out of the return manifold and fitted a new adapter wit fresh O rings but it's still leaking out of the unused port!!(but not nearly as much) I can only assume that the plastic in the housing is also...
Thanks for he reply, if the flow adapter is the part causing the leak would the water be rising up out of the unused port? I hope so as this looks like a much easier fix! :)
Hi all, I'll try to keep this as brief as possible and thanks to everyone in advance that can offer advice. I have a Worcester Bosch greenstar Junior 28i combi boiler fitted mid 2011. It's leaking from the 'unused port' situated just on top of/behind the flow turbine on the return manifold (on...