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Thanks Bunnyman for your suggestion. The boiler is actually28 years old. I have replaced the expansion vessel a number of years ago when I had a leak from it but since then it has worked beautifully. I pumped up the bladder to 0.9 bar a while ago, and replaced the schreider valve at the same...

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...

Thanks for the suggestion. I don't think it is this as I have no evidence of a wet patch in the ceiling when looking up from the ground floor. I must admit I cannot check under the floorboards on the ground floor without taking up all the carpets. The pipes under the ground floor have not been...

Thanks for the reply, but I have not seen any discharge from the prv.

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...