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The pressure in the boiler is usually at 1.2 bar, but every couple of weeks I see the pressure slowly decrease to about 0.8 bar.By the morning the pressure has dropped to 0 and of course the heating will not come on. When I re-prime the system the pressure gauge rapidly goes up to 1.0 bar and...

I have had the Vaillant combi installed since 1985 and I have been very pleased with its performance but now have a problem. I need to pressurise the system at least once per week. I pressurise it to 1.4 bar, and within 3-4 days the pressure has dropped to approx 0.4 bar or lower. I have...