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Thanks all. The perplexing part is that the pressure is fine for about 30 days (checking daily) and then collapses on day 31!

Hi there. We have a Vaillant system boiler which has recently had a new expansion vessel and PRV. However, we still have some kind of pressure issue. The pressure remains pretty constant with daily checks and similar usage patterns (typically 1.4 or 1.5 bar) for about 4 weeks, but then suddenly...