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how can I fix leak on combi 105e?

I have a water leak between the diverter manifold and the DHW pressure differential valve,I have replaced the diaphragm in the in the differential valve,what else could be causing the problem?
mike sidaway, July 2008
hi there corgi bloke,did what you said,bought a kit and changed all parts,still got a slight leak, can the water come through from the diverter manifold side,and what maybe the problem?

mike, August 2008
very common leak on this boiler there is a o ring behind the dif pin hexagonal brass nut which always fail and allows water out via the pin if you have changed the dia already its easy enough

corgi bloke, July 2008
link Click here to see other fixes for Baxi 105e.