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Combi boiler pressure goes high when lukewarm

My combi boiler pressure reaches the maximum and the release valve lets out water yet the water is only lukewarm (or at least, all the radiators are). By the time the water is hot enough to heat...
18:08 Fri 26th Dec 20084 answers, last by gucciman 23:15 Sat 27th Dec 2008

Only 1 question