I have a Vaillant combo boiler that is 9 years old. It has recently started to lose pressure over a period of 2 weeks. I have had Vaillant engineer visit and replace the expansion vessel 2 days ago and it has now lost pressure. Is this connected to the new expansion vessel being fitted and will settle down or is it the original problem just getting worse? Any advise would be appreciated.
- Thread starter RoyWin
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