I have a problem with biasi 24s 90e combi boiler which is dropping dropping filling pressure (aproxx 1.8 bar to 1.2 bar in a couple of weeks), but the the heated pressure is remaining constant approx (2.2 bar at 55 degrees) when heating is running. Is this more likely to be a leak or a pressure gauge fault as I cannot understand why the filling pressure is dropping but the heated pressure remains constant.
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