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Tried a few of your tips and looked at the FAQs from the site. Released the pressure using the PRV to 1.5 bar, the pressure didn't rise. Tried hot water only, then central heating and everything seemed to work ok and has been since Friday (stays at 1.5 - 2 bar). Could the PRV have been sticking...

The pressure in the combi boiler steadily rises, over about 8 hrs, to 3.0 bar. I've had to keep on bleeding to bring the pressure back down. This happens even with the CH function switched off. I've checked that the filler loop is completely disconnected. I've also switched off, reduced the...