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Sorry I think that I need to clarify; I top up the system to the manufacturer's specified pressure, and then turn the boiler on to constant. However, when it is on a timer, and not on, the pressure goes down within 2-3hrs. I don't actually ignite, as the boiler turns it's self on, but is...

After topping up, it only lasts an hour or two, if the system is not on. No leaks from the Rad valves, have bled the rads, nothing too abnormal there. Wondered about scale build up though.... Thanks for your prompt reply.

When our combi-boiler is off the water pressure drops so much that the boiler is not able to ignite. When the boiler is on the pressure go up and we are able to get hot water and hot radiators. We are constantly needing to top up the water in the system so that the pressure is sufficient for...