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I have the same boiler and periodicaly have your problem too. The solution for me and a great many others is to remove and clean/descale the dhw heat exchanger, its quite a common fault on those boilers. Ive seen replacements if you dont want to do that from between 50 quid to 130 quid...

Hi all, did a bit of snooping 1st but I was unable to find an answer so here goes. Ive a Vaillant 824e/828e which is about 10 years old now. Only previous problem with it is the famous hot/cold water issue to which ive cleaned out the dhw heat exchanger on a few occasions now. Upto to day...