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I bled the pump, it's now on mid-speed and the boiler is firing up automatically. Where I'm at now is that all the rads are getting heat except one distant from the boiler, but there's no hot water in the tank and the pressure is still dropping to under 1bar within hours of re-pressurising each...

Hi, hope you lot can help here, and that this is sufficient info to go on. I have a sealed, pressurised system w. a Potterton Suprima 40 Two months back I had a leaking rad replaced (a friend switched the boiler off, the drained the system down etc). Since then the pressure has dropped below...