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I have a leak at the back of the dhw pressure differential valve, i changed the dhw pressure valve but it looks like it is leaking from a gland on the brass manifold where the dhw pressure differential valve connects with the spring clip. It only leaks when the running the hot water. Can this...

Has anyone come across a problem where a baxi is only working intermittently? It goes through the sequence up to sparking but the burner will not always light. I keep resetting it and it may then light & be ok for a few days. It never goes off if the boiler is left running. Thanks.