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how to fix my ariston boiler ?

when the boiler is asking for hot water , it comes out look warm , and when the tap is turned off the heating comes on untill the radiators are red hot and turns off , sometimes the boiler will produce red hot water and work properly ,,,,,,, the dirverter valve has been replaced and it has been flushed out , and there is a filter on the return to the boiler , what else could this be please

ariston boiler a/23 mmfi

mark
September 2011
fault code eo34 keeps appering but had airpressure switch changed any ideas

mouse 40
December 2011
did you clean hot water heat exchanger still some blockage in,take it out and clean with acid

ltd
September 2011

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