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Firstly, I know there are loads of posts about similar problems, but none fit my boiler's symptoms exactly... I have a Ferroli Optima Combi Boiler, in which the pressure drops. For example, when the central heating is on, the pressure will be about 1.5 bar say (it sometimes rises slightly...

The water pressure in my central heating system frequently drops. After re-pressurising it, it returns to normal, but then the next time the heating is switched off, the pressure drops again. Any ideas? I have a combination of old "cast iron" radiators as well as more modern ones. Could this...