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How can I fix my Potterton Performa 28i?

In heating mode pressure builds up quicly to3 bar then pressure relief operates , when boiler cools water has been lost and I have to top up almost daily. No problems in summer pressure stays at 1 bar. Any ideas?
tony Condron, September 2010
very common. yr expansion vessel

paul kiangala, September 2010
Expansion vessel needs re-charging/replacing

Carefree, September 2010
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