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One was never fitted when installed, however the problem seems to have arisen since I had an additional radiator installed.

There isn't an expansion vessel

Can anyone help with a problem with my boiler (CH). The pressure runs around 3bar but occassionally drops below 1bar, after filling upto 1bar the boiler ignites then runs upto 3bar then drops again to zero. This occurs for around 24 hours then settles down to run at 3bar.