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How do I fix my potterton lynx II?

My potterton lynx II combi boiler is not working correctly as the hot water circuit is fine but the heating system/pressure does not work at all. When you try to put the heating on the pressure builds and blows out the pressure discharge valve.
Kelly Smith, March 2008
sounds like your expansion vessel has gone

gary.wright53@googlemail.com, March 2008
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