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As this is a plumbing forum, I didn't bother to complicate the original post with the fact that I had included a 2 hour delay-off timer to the pump so that once it sees the temperature from the initial start up, the pump switching is debounced for 2 hours; long enough for the fire to reduce to a...

well guys, thanks for the positive responses. The cause of the problem was that the new situation for the pump had put the breather on tje high pressure side of the pump so I reversed the pump and I now have a system that's quieter than it's ever been in 15 years. Job Done.

Good day all. I seem to have more air in my system than I know what to do with. Here it is, as concise as possible: Original system: Gas boiler on ground floor (two pipes and a mains lead). Hot water cylinder; rads; a-b valve/pump/Honeywell controls on first floor immediately above. All...