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Yes, thanks to the great advice on here, I managed to get my boiler going again by replacing the PRV and expansion vessel. Bolier is working perfectly except for one thing. The front panel requires a gentle tap for the bolier to ignite when the central heating is timed to come on. I figure its a...

Hi. Hope someone can help me. I have a High Flow 400 electronic combi boiler. Just replaced expansion vessel since the old one was knackered. Pressure set to 1.5 bar but water venting out overflow pipe before and during use of CH. Have to keep adding pressure but this keeps venting away?