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Hi 2.5 bar as far as I can tell, then drops to 0.5 bar when boiler cools down after discharging water from the pressure relief pipe. I've ordered a replacement expansion tank.

Hi My Ideal Mini C28 has recently started losing pressure. Cold pressure is set to 1 bar, when running this increases to just over 2 bars. It is discharging water from the overflow and within a day the cold pressure drops to 0.5 bar. Also, it has a tendency when running to cut out, then start...