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My combi boiler works fine when running, however when it's left off for a while such as overnight, it loses all water pressure. - I've checked and replaced the PRV and confirm that no water is lost at the PRV - I've installed a new Expansion Vessel and confirmed this is working ok - I've...

I have a Vaillant gas boiler that has a water pressure gauge and a Megaflow storage tank that also has a water pressure gauge installed near it. My problem is that the water pressure gradually drops from 1.5 bar to zero over the course of about 3 weeks - I can re-introduce the pressure by...