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Hi, The pressure seems to increase slightly after the central heating has been on. On Wednesday 19th I drained system slightly so that it was at 1.3bar and by Monday 24th it was at 1.7bar. I did'nt have the central heating on too much as the weather was mild. On one day previous to this when I...

Thanks for the suggestions. The filling loop is the integral type with a valve on the mains cold water side and another on the central heating entry side, so I'm finding it hard to understand how this could be letting in water as that would suggest that both valves are faulty. Ive closed and...

Hello, I have a Vaillant Ecotec Plus Boiler. Every time after the heating has been on, when the system cools down I notice that the water pressure increases slightly. Yesterday I emptied the system to show 1.3 bar, yet after the heating system had been on that night, the next morning when the...