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Thanks for the reply, my mate had already took out the heat exchanger & descaled it & it seems to have done the trick, but i thought i would thank you for your advice anyway. To answer you 1st question, it worked ok on heating, cos the first thing i thought was it could have been the pump...

Hi all, my mate has a vailant aquaplus combi & it is cutting out when he runs the hot tap (the temperature rises rapidly, then it cuts out). It shows a fault code 24, which i am led to believe is due to poor circulation. he said it makes alot of noise when running, consistent with possible...