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Thanks . I am a bit concerned that pressure didnt snap back up to 1.1 bar (initial sits) as i reopened the flow & return valves.. but to approx 0.9 bar. (and that its only when i also reopened tha auto fill that it went to 1.1 bar) If its "just" the boiler that would be a relief for me, i have...

Thanks for your replies - much appreciated. I have done the following *Test #2*, based on suggestions above : - I closed, at boiler level, the flow and return valves, of the central heating - I closed the autofill loop (I left it 5 hours - at initial situation pressure was 1.1 bar as usual) -...

Thanks very much for your replies. That's a good idea, i will try closing the flow & return valve at boiler level to see how the pressure behaves. ---> Can you help tell me which of these are the 1/ flow and 2/ return valves, on this photo ? Also i am attaching what i call the "auto fill...

Hi - looking for some much needed advice & clarity on what may be happening with my setup.. any insight greatly appreciated - Context : i have a Baxi combi boiler in a recently built home (both from 2020). The home has underfloor heating throughout, on 2 floors. My boiler is loosing...