UPDATE:
Went back today, stripped the whole lot down again, located the oring in the manifold, pu it all back together again (putting the bypass in the manifold first and not last!!!)
Eventually filled it, and water started ****ing out of the top right connection of the dhw heat exchanger.
Im going back to IT
Went back today, stripped the whole lot down again, located the oring in the manifold, pu it all back together again (putting the bypass in the manifold first and not last!!!)
Eventually filled it, and water started ****ing out of the top right connection of the dhw heat exchanger.
Im going back to IT