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Thanks for all your comments very much appreciated - i will get the chemicals out and get this clean lol obviously with my mask goggles and rubber gloves ;-)

Ha ha thanks AGAS ;-) So the heat exchanger needs cleaning lol - very helpful :-)

Thanks Dan, could you explain this to me in idiots terms ? Cheers Nick

Hi, I was windering if anyone could assist me with understanding what the blocking code bl 12 means on my Atag combi boiler. I have checked in the installation and servicing instructions, but this code is not listed. It maybe a coincidence but it would appear that this code is displayed when...