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how can i fix potterton prima?

i have a potterton prima boiler which works fine on ch and on ch/hw but when i put it on hw the boiler trips out after about 2 mins. have put new cylinder stat on and 3 port valve seems to be ok. any ideas please
jason, February 2011
if this has only just started possibly overheat stat faulty or boiler not modulating

brian, February 2011
link Click here to see other fixes for Potterton Prima.