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Old Celtic 2.20ff rsc?

My Celtic is old but works very well, but the pressure creeps up, if i turn of the cold water feed on the boiler it stops, can you help please?
john.bee@virgin.net, February 2008
Thank you for your help! Curtis Lee Patrick.

john.bee@virgin.net, February 2008
Main heat exchanger is letting mains cold water into heating system. Doubt very much you would get a new heat exchanger for that appliance. If not, then you will need a new boiler I'm afraid !

Curtis Lee Patrick, February 2008