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Mend Ariston Genus HE 24 MFFI Error Code Heating

how can i fix my ariston genus he 24 mffi boiler?

when the water runs hot all of a sudden it starts cooling down and shows either E 33 or E 34 code then it clears and runs hot again this keeps happening on and off while the tap is running i looked at the pressure gauge and the marker is on the 2nd blue dot under the black ones if that makes any sense

scruff
September 2010

Ariston Ariston Genus HE 24 MFFI Heating, Home Heating Systems Ariston Error Code Heating

the heatexanger is blocked , therfore there is not enough flow and the water goes above the seciruty level and the boiler shutdown untill it is cooled off

William
October 2010

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Ariston Genus HE 24 MFFI Boiler - Fix E33/E34 Error