Just fitted two new automatic air vents, like-for-like for the old ones, which were leaking badly. Now the system loses pressure unless I tighten the vent screws in fully.
No water leaks I can see, and I assumed it'd take three or four days for the vents to vent the surplus air in the system, after the drain down, so I didn't pay too much attention to the pressure at first. Just topped it up now and again. Assumed it would stabilise now.
How long is a reasonable time for the system to self vent?
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