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Hi Tony, Thanks for the reply. I wouldn't be doing it myself (as I am a bit useless in this area unfortunately), and I am just trying to find out more of the theoretical side. So it could very well be either what you say, or a blocked HE. So would that require a power flush or would the...

Hi, I am experiencing the same problem myself as OP. I have Vaillant ecomax 824e and getting E12. Was this problem solved in the end? And if so, what was the actual fault? Was it to do with the black flexi rubber tube or the PHE? Thanks!