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ariston microcombi 23 pressure release valve?

my boiler constantly has to be topped up to be able to work, there is water constantly running from the overflow outside and will not maintain water pressure, is it just a faulty 3bar safety valve...?
Quest, December 2011
could be or it could be a blockage causing a localised pressure build up making the relief valve operate

A1, December 2011
link Click here to see other fixes for Ariston.