baxi duotec 28 he hot water fault,,, opinions please

[cdodds2004]

been to see a fault on a duotec 28he today, central heating working fine, boiler banging its nuts off on hw,,,
stat for hot water turned to less than half temp gauge rising all the way to high 80s and banging! now this leads me to think sludged up plate heat exchanger,,, boiler has been fittend on a a old conventional system has no magna clean and no evidence i can see of inhibtor or poweflushing.. but boiler is on 2years and 2 months old! so very quick for plate to sludge up, now do u have any ideas if this could be anything else, or am i right in thinking its the plate heat exchanger!!

thanks guys

 

[Billy Bob Bob]

see my pm,yes it is a plate heat,take it out and clean it,if that fails replace it and de scale the system