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Or Edgar?

Tighten first then start releasing.

Why not go for another Main? Eco Compact. Oh, and it's a Baxi.

I use Laco liquid ptfe

Paste up the pipe in front of the olive is my MO.

Probably because most people say they want a Megaflo, not knowing that's a brand name.

There is no gas filter. Perhaps you mean magnetic filter?

When you do the pressure/flow tests, make sure it is done during peak hours.

:cool:

Let's hope it doesn't do that eh! ;)

Natural gas or LPG? The only filter on NatGas is a mesh screen which rarely needs cleaning unless you're in an area known for dirty gas!

What Gas filter?

What filter?

Depends how it's been piped! Especially as it's a bungalow.

Mate, why bother with the things that you and I suggest when there's so many physics boffins on ere! :rolleyes: Occam's razor anyone?

AAVs can admit air as well as vent it. As mentioned by another poster. High up ones are more likely to be worth investigating. Negative pressure on suction side of pump can pull air in via them. IIRC you mentioned getting lots of air in the system... It could well be via the AAVs.

If it goes on for hours after Heating gone off, it sounds unlikely to be anything mechanical... CH wise that is. I'd close those AAVs.

Check flow and pressure at the mdpe. Get water supplier to check pressure and flow rate at their stop tap.

One pipe is near, the other further away Father Dougle! ;)

Same thought : Tried turning one rad off at a time, overnight, in case it's one of the rads?