My open vented central heating system suffered from air ingress so I had it converted to a sealed system. However, this has not cured the problem, air still collects in one of the upstairs radiators. I've done the hydrogen test and it really is air. Any idea how it can be getting in? The at cold system pressure is constant, so I presume there are no leaks. As the air collects the pressure doesn't rise but when I bleed it out I then have to replenish the system via the filling loop to restore the normal "at cold" pressure. It makes no sense to me!
- posted
18 years ago