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is this a big job/expensive? I've only just spent money on it replacing the hot water/heating valve switch thingy!

HI, I have a Ravenheat COMBI boiler. for the last couple of weeks I have had to add pressure daily. When the heating is on the pressure goes up to 2.5 - 3.0 bars and when the boiler is not in use it drops down to 0.5. Does anyone have any ideas? There does not seem to be any leaks